We had a real horror story with Remax - similar in setup to Century 21 as a company - total deception and theft, with all the evidence and witnesses; I assumed Remax would be horrified too. All they did was explain that I would have to take it up with the local branch.
What I learned from this is that people take great assurance from companies like Century 21 and Remax being global players, when actually when things go a bit corrupt, they immediately run for cover and refer you to the local branch - the very people who went a bit corrupt.
My advice has never changed - find out who helps people buy or sell without issue or drama, and do your business with them.
Don't draw great comfort and assurance from global brands - I assure you they afford you way less than a good local guy will.
If I was buying or selling in Calis/Fethiye I would deal with Cenk & Olga at Interturk, because I know them, and I know that in the 15 years I have known them, they have only boring stories of how people bought or sold without issue or incident. I also have dozens of far more exciting stories about people who bought through other agencies and ended up with nothing apart from a remortgage.