MTN Unetical

i cancelled my contract in 2022 November, and then ported by number across to vodacom. To date and after many calls and email, MTN continue to bill me monthy. They cannot provide a resolution to a simple task, billing a customer after cancellation is unprofessional and unetical. the time is takes to continue calling in to get them to resolve this issue surpasses the monthly bill . if there were negative stars i would provide them...