Contract cancellation dragging.

I’ve trying to cancel my contract for the past 8 months with MTN. I initially went to the stores and was told that they cannot assist in this regard , I need to call their call centre. This was in August , I kept on calling and to no avail I decided to DM their Twitter account telling them I had been trying to contact them regarding cancelling my contract instead of upgrading it. Beginning of November with no response I decided to DM again and this time around they rep**** requested my personal information to log in an application for the cancellation. I was told that someone would contact me to finalise that application and no one did. Mind you they are still debiting from my account every month, an expense I would have liked to get rid of earlier. 10 days later I sent another message to let them know that no one had still contacted me to finalise the application and I was told once again that the number was still on contract and that someone was going to get back to me. The entire November went by, I still kept on calling 135 to try and cancel the contract and I would just hold for the entire day . December went by, January and late February i went to try and cancel the contract again and I was made aware that the application had been logged in in November therefore the store can’t cancel the contract for me. This is really frustrating and disappointing because while they take their time to sort this issue out they’re debiting my money . Money I don’t even have . For the past 8 months I’ve been trying to do one thing , this is just unacceptable. This is poor service and they’re blaming the backlog. I’m very annoyed by what MTN is doing .