BAD SERVICE FROM MTN

I have been trying from 18th December 2017 to have MTN remove the insurance cover from my Invoice/Statements as I no longer have that Mobile device and my new device is covered by my personal Insurance cover. After sending numerous emails and getting no where, I contacted the call centre only to be directed Pinnacle Marketing. Cynthia from Pinnacle assured me that the cover has been cancelled and that this premium will not be on my statement and even refunded me 1 months premium. To my surprise my Jan Invoice payable on the 01 Feb, showed the insurance cover. When I contacted Pinnacle and Alice responded she told me that that amount showing was the amount that was refunded to me. So Pinnacle refunded me and then debited me on the 01 Feb for the same amount. My Feb statement due on the 01 March still showed the Insurance premium and when I contacted the contact centre , the agent was not very helpful but I got a message on SMS to confirm that my issue has been sorted out. Far from it MTN, you debited me again for Insurance Cover.

I have sent numerous emails and proof payment but still no resolution.

REMOVE THAT INSURANCE COVER FROM MY STATEMENT AND STOP DEBITING ME ONCE AND FOR ALL. I WANT A REFUND OF ALL THE PREMIUMS THAT HAVE WENT OF MY ACCOUNT FROM JANUARY.