Horrible service

I am currently not getting any service from the Edgar's accounts department and the call centre. I requested for my account to be closed in December and asked to be sent the proof of account closure. To this day I still haven't received the letter. I have tried several times to call them but my call is always cut. I really need this letter as its affecting my cellphone insurance validity. I have sent the supervisor an email also never received any response from them. I have never experienced such ridiculous service especially from an accounts department. I'm really glad to have closed my account because I cannot be dealing with such bad service as if they are doing me a favor when it is their job to assist clients.