Unable to Cancel service and no feedback from staff

I cancelled my Telkom services at the beginning of February 2018, with the normal 30 days’ notice period as per their requirements. I received an e-mail that my documentation was received and that the request will be processed. Unfortunately the monthly invoices were still sent to me. When I followed up on this I spoke to Zintle Mpati from Telkom. I re-send her all the relevant documentation and she informed me that it was a mistake on their side and that she will make sure it gets to the correct departments in order for the cancelation to go through and for the reversal of charges. Unfortunately I am still being invoiced. I have sent a total of 97 e-mails to Zintle Mpati, but I only receive read receipts and no response from her what so ever. I have since learned that there have been several complaints on Hello Peter pertaining to Zintle Mpati not responding to requests. Come on Telkom, why do you not employ staff that don’t take accountability and who do I need to contact to finally put this thing to bed?