Cancellation request ignored

On 15 January 2016 I submitted a cancellation form with my ID to [Email Removed] I received an immediate response from the server confirming receipt of my email and assuring me I would be contacted within 48-72 hours. <br> <br> It is now 15 March, and I have not heard back from this department, and Telkom have continued to bill me and debit my bank account for the service which I am no longer using and asked to have cancelled 2 months ago.<br> <br> I contacted the call centre, and Thembisa was very helpful and advised me to send this mail which I initially sent to [Email Removed]<br> <br> I did as she instructed and received a mail confirming receipt of my mail. However immediately thereafter I received a \MailDeliverySystem\" error email from telkom saying that my mail could not be delivered to this email address as \"The recipient's mailbox is full and can't accept new messages at this stage.\"<br> <br> How is it possible that Telkom's (an ISP) TOCescalations mail box is full? Please advise me what action I need to take to submit my cancellation form successfully and request a credit for the months I have been billed after requesting cancellation, this customer service is unacceptable.<br> "