This is why all transactions have to take place here on Fiverr, you both broke the rules and if you paid him outside Fiverr, Support can't do anything since this isn't in their control. It is very important to read and follow the rules when signing up on an online marketplace. The only way to solve this in...some way would probably be by taking legal action against that person but of course, outside Fiverr since the transaction didn't happen here. It's complicated at this point, I assume that the location of that seller is important as well... Justice doesn't really work the same everywhere