What is the name of your state? Florida. Got another question. On Friday the 12th I agreed to settle a smaller account, 30% less than the original amount. I agreed and asked that a letter be faxed to my bank stating the amount and that once the check was received that the account would be settled in full and I would then get a bank check and mail it to them in the amount of $325, I also wrote on the check "paid in full" and have the copy of it. Yesterday I get a letter saying I owe an extra $164 in interest. The letter from the CA mentioned nothing about any added fees, interest etc. Am I liable for the extra fees since it was not mentiond in the settlement agreement letter? ALSO since I already mailed out several "in good faith" payments to other CA's, is it too late to mail out validation letters?