We had a brick cleaning contractor that hasn't completed the job and billed for the whole amount due. Then he is trying to charge $300.00 interest after only 7 days after I received the bill. He also said that he is going to lien the property and his lawyer fees are $3,800 which we will be charged. Our problem with paying the whole bill is that he caused damage to our customers brand new stainless steel hot tub with the acid wash he uses and us and the customer had to pay someone to try to buff it out to hopefully fix it. This was out of our pocket not the brick cleaners. We owe him $1,700 and we look it as a fair amount to pay him only $1,000 due to the damage and the uncompleted job. Can you please give me some advice for this situation on what we should do? Plus, is him trying to charge so much illegal?