No response to line cancellation request after numerous emails and phone calls

We are closing our business and vacating the premises at the end of January 2018. I have sent and email with a line cancellation request ( ********** ) on 30 November 2017 to ********** requesting the line cancellation and removal of the Opticon system on a company letterhead with ID attached as required. I received an auto-reply from Telkom SMBS Retention Centre stating "We hereby acknowledge receipt of your fixed line Business Contract and Services cancellation request. Your request will be attended to within 21 business days." After 21 business days, nothing happened, so I resent the email numerous times requesting a response, but to no avail. I called the call centre and talked to a guy who said that I should resend the email to ********** and put the reference AI ********** in the subject and I did that on 17 January 2018, but still no response or feedback. We will start moving this weekend and the system needs to be removed ASAP as we have to vacate the premises by 31 January 2018!! It is almost 2 months since I first sent the cancellation request and still no response!