Poor service

If i could i wouldn't even give them a star. Am really disappointed in this company. I had the account with them for going for 2 years this year and being paying extra so that i can close off the account. On the 20th of May i called and was told the remaining balance that i paid while on call with their agent. Since then i have been sending emails requesting paid up letter and those emails are not even being responded, if they do respond they respond after 2 weeks. This morning i got a paid up letter that have been addressed to someone that i dont know. Have i mentioned how difficult and a mission is to get through their billing department as they keep on hanging up the call after being directed. Now am being told to wait 14-21 days to get the corrected paid up letter. Why on the first place did they even send the incorrect paid up letter to us. That's pure ignorance from the person responsible that should be taken into consideration. If this had confidential personal information about customers it basically means the information is not safe as it will be send to incorrect recipients.