MTN CONTRACT

I took out a mtn package consisting of a phone and MADE FOR HOME 30GB data sim. - I wasnt that the sim would only be compatible in certain routers. - I called Mondo on the 9th August to cancel my data sim card so I could apply for a new sim card and router. - I have been calling every other day to date regarding feedback on my query. i KEEP BEING TOLD IT IS BEING ESCALATED OR THAT THE SYSTEM IS OFFLINE. To this day it has been over a month that my query is still being escalated, I AM TIRED OF CALLING AS I HAVENT BEEN USING THE SIM CARD because it works in the router for 45 mins then I have to call MTN again so they can reconnect. I am being charged for something I am not using. I call mtn they tell me it is not cancelled, I get transferred to cancellations and wait on the call for more than 30 mins with no assistance.

I dont know what to do anymore.