Unless you have a reason to believe the check itself was entirely made in error or fraud, such as being stolen, or it written under duress or misinformation where it would otherwise have never been written (or the payment made at all), then a stop payment on it would be wrong, and may even be illegal. In this case, the problem is that SOME of the amount is legitimate. In order for you to defend your stop payment, you would have to show that the check never would have been paid nor any other form of payment made. If he never performed ANY work, that would be such a case. But he did do SOME. Stopping payment on that part is what would be wrong and get you in trouble, even if you have an open and shut case against him on the extra amount.
Your mistake here was combining the undisputed and disputed amounts. Your only safe course is to take him to small claims court, after doing what DC suggests and giving him a chance to fix it (write a letter and demand a return of the disputed amount and explain why). If he fixes it, all is well.
Your mistake here was combining the undisputed and disputed amounts. Your only safe course is to take him to small claims court, after doing what DC suggests and giving him a chance to fix it (write a letter and demand a return of the disputed amount and explain why). If he fixes it, all is well.