MONFO-MTN CHARGING ME FOR SERVICES I DONT USE

I app**** for an upgrade last year to a home router and cancelled it later because it was not made clear to me that I will lose my current number. Mondo refused to take the router back at first but eventually they said I should take it back to the MTN store and a number will be given to me which I would have to submit to MTN. I did that, still after 2 months my number cannot make calls, every month I am still being charged for internet that I do not use. The router with with them at the store.

I have tried calling from friends phones but the call centre agents always say that they are transfering me to contracts but immediately the phone gets dropped. Online support they say they are no managers or supervisors they are working alone.

I demand answers on why am I still being charged for services I do not use.