Collection agency collected money due my work as an independent contractor. I received proof of payment from my client showing cancelled checks payable to Rapid Recovery Solution. When I contacted Rapid Recovery Solution by phone for an explanation they confirmed having received payment but that I still owed them more than they had collected arguing an unilateral change on the agreed commision percentage. The contract signed between the parts clearly stated that the collection commission should be 14 percent out of $6, 300 for a $882 commssion nevertheless, Rapid Recovery Solutions changed it to a maximum of 49 percent or $3087 commission . Lucky enough, my client sent directly to my address checks for $4, 200 and $2, 100 to RRS. Ever since, RRS keep calling me to find out my new address to mail the invoice for the allegedly owed amount. I am now going to forward the contract, and proof of payment from my customer to the NY General Attorney's Office.