Telkom is still invoicing me 5 month after I cancelled the line

I cancelled my Telkom line on the 22nd of March 2017 via email and send it to ********** (account number: ********** 56095). After I still received invoices in May I called the hotline again. I spoke to a person and she told me to resend the cancellation to ********** (what I did) and that she would escalate the matter. I still received invoices and called the hotline again. They told me that they can't do anything for me because the matter is already escalated. I send another complain on Facebook on the 26th of June and they said that somebody will contact me. I still received invoices afterwards. I contacted the Special Forces team on Facebook again on the 8th of August and they answered: Hi, we apologize for the delay. We have requested for further assistance. We will make sure your query is attended to. ^Maggy. Still they invoice me 174 days after cancellation. I have no idea what to do anymore. Why is there a Special forces team on Facebook if they don't deal with your queries? This is really bad customer service. I can't get any information at the help hotline because they already escalated the situation. I also can't get my deposit back until the line isn't cancelled. Is that the reason why Telkom makes cancellations so difficult?