Be professional with difficult people. There will always be difficult people who want a product or service for next to nothing. People who think they know everything, including how easy it is to do other people's jobs. The biggest mistake is to play to their level. Remember the saying, “Never wrestle with a pig. You’ll get muddy and the pig likes it.” By taking the high road, keep above the fray.
1)Learn to be a Better Business Negotiator:Understand where the difficultness comes from. Sometimes people have bad days. The big deal falls through. Their dog dies. They don’t feel well. No one is always at their best, right? Try and make allowances for this and give people second chances. For the chronically difficult ones—the ones who exhibit nasty behavior on their second, third, fourth and tenth chance—recognize this as a fundamental insecurity, unhappiness, anger or bitterness.
2)Give Difficult Customers' Egos a Boost:Sometimes egos need to be boosted. When customers and prospects try and show off with how much they know, flattery can be an appropriate response- without going over the top. Something like, “Those are some excellent points based on sound experience.
3)Know When to Say When to Difficult Clients:Know when to cut losses. It's a last course of action, but there are some clients who just can't be managed. They make life so difficult and provide so little return for the effort. No one wants to see money walk out the door, but if the headache and expense add up to more than it's worth, it's better to walk away from the deal.

The challenges of dealing with Joe who makes loud personal calls from the next cubicle while you are trying to work or with Susie who hogs the copying machine to make personal copies are gone if you freelance for a living.
However, no freelancer truly works alone. We may be alone in our home office, but all of us depend on other people to earn our livelihood. At the very least, all freelancers must deal with clients. It’s how we get paid .It turned out she was a chronic pain sufferer from an auto accident. I have some medical work in my background, so I realize how chronic pain and narcotic pain medications can cause people to act erratically, so I don't have any bad feelings toward the client.
What I learned from the situation is that you need to step away sometimes. If a situation gets hurtful, you do not have to tolerate it.Just refund the client's money, tell them you're sorry you could not help them, and move on. Don't keep struggling if it's not working out.

It is easy to work with people you like, and it is even easier to work with people who like you. But that's not always the case. Sooner or later, you'll have to deal with a difficult customer.

Difficult customers come in a wide variety. There are those whose personality rubs you the wrong way. They may not be difficult for someone else, but they are for you. And then there are those who are difficult for everyone: Picky people, know-it-alls, egocentrics, fault-finders, constant complainers, etc. Every salesperson can list a number of the types.

But perhaps the most difficult for everyone is the angry customer. This is someone who feels that he or she has been wronged, and is upset and emotional about it. These customers complain, and they are angry about something you or your company did.

There are some sound business reasons to become adept in handling an angry customer. Research indicates that customers who complain are likely to continue doing business with your company if they feel that they were treated properly. It's estimated that as many as 90% of customers who perceive themselves as having been wronged never complain, they just take their business elsewhere. So, angry, complaining customers care enough to talk to you, and have not yet decided to take their business to the competition. They are customers worth saving.

Not only are there benefits to your company, but you personally gain as well. Become adept at handling angry customers, and you’ll feel much more confident in your own abilities. If you can handle this, you can handle anything. While any one can work with the easy people, it takes a real professional to be successful with the difficult customers. Your confidence will grow, your poise will increase, and your self-esteem will intensify.
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Dave Kahle
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On the other hand, if you mishandle it, and you'll watch the situation dissolve into lost business and upset people. You may find yourself upset for days.

Be politely
do not angry with the customer