Level of poor service

I was handed over to Nimble Collection Service through FNB regarding one of my accounts. After making payment and settling the account, I wanted to get a settlement letter stating that the account is paid in full. Payment was made last month and up until now, nothing has been received. When contacting Nimble and deaing with numerous consultants, who inform you that they will get back to you, but never do and up until now I still have not received any feedback to date. I find this level of service absolutely appalling and am discussed in Nimble. This also reflects badly on FNB itself.