Bad service

I called TymeBank, asking for written proof that a case they were investigating with me has been resolved. Since this involves another bank, surely, they can just call the bank and ask for some written confirmation. I need this to send to a person who claims they haven't received my payments. I have sent POPs and bank statements, but still, the amounts apparently don't appear on the statement. I just need TymeBank to give me written confirmation that the money was credited into the person's account because I don't know what to do at this point.