Account not closed after formal request

I put a formal notice to close my landline in May 2015 in Telkom Johannesburg CBD branch. Telkom gives a one month notice to close the account. In July 2015 they were still billing me, in August 2015 they were still billing. I went to Rosebank Mall to inquire why my account is not closed after I put a formal request that request. I was told they have seen the account was closed however they could not tell why they still continue to bill me however they were going to investigate thus I should not pay the account since they will reverse the billings. Within weeks I started to get calls from the debt collectors that I am owing Telkom. I told them the story and send them e-mails and let them know I am awaiting Telkom to reverse all the billings. In October they reversed the billings but now I am already handed over to the debt collectors without given an opportunity to settle the correct balance which has interest charges that is due to them being unable to close my account on time and let me settle also on time.<br> <br> My mobile line it was due to end in July and I had requested that it is not extended but I am still billed R49 monthly. I queried this in August/Sept but nothing fixed