Mtn still billing me for an inactive contract!!!!

MTN is yet to cancel my contract which has active since March 2019 it came to its end in March of this year but before that they called me again and offered me another contract, I agreed because they said I was spending far too much on data and this would save me money. It’s STILL on and i have called them multiple times with no help!!! Please cancel contract number ***. Another thing is that it moved from 299 to 1189 p/m I don’t understand. PLEASE CANCEL MY CONTRACT I no longer use that number nor the router!!! This month I’ll only pay for the active numbers not the ones that they don’t want to cancel this in an attempt to keep me in debt. I have called and even went in personally to the store and no help has come my way I am desperate please OK.