Close my account

I have settled my account in July 2017,I then called RCS and asked for my account to be closed. I was told that the account will be closed on13 August, today it’s 26 September account is still not been closed. I have called again and I was promised that I will receive the letter confirming when my account will be closed,because there was adjustment on my account since the account its been over paid but I still have not receive the letter Please close these account immediately and update my ITC,these is affecting my ITC score it’s been 2 month nothing have been done Treat your customers fear and honor your commitment. If you commit on something to your customers do it. This is not acceptable, I demand feedback in this regards.