Paid up letter

I am writting this as a last resort because I have not been assistes. I have paid up my account and have requestes a paid up letter. Everytime I call I am told they will send it but still nothing recieved. Today I called again and the consultant was rude and put the phone down while speaking. This is disgusting behaviour! I had to call back again and was told the letter will be sent. How is it so difficult to close an account and send you the proof. This is the worse place ever! Disgusting attitudes!!