Cancellation

I app**** for uncapped router in September 2021 and received the router in October since I received the router never worked I complained at MTN but they said they can't help me I contacted mondo they kept on dropping my calls without any help

I finally decided to return the router to MTN in November but till to date mondo is still deducting my money

They are not willing to activate the cancellation

I tried to reverse the debits but they registered their account on credit bureau which will affect my name if I don't pay them When I reverse they come back and double debit