Rewardsco MTN billing for a device I don't have.

I bought a Huawei Y64 from Rewardsco on contract in October and it was delivered on the 27/10/2025. However, the device malfunctioned constantly and I phoned to cancel the contract within 7 days of receipt. The couriers picked it up from me and the warehouse received the device, according to my waybill. Yet, i was billed for a device I don't own, or have...Since then I have sent numerous emails with no clarification, just the same message..."a cancellation has been logged, as soon as the warehouse confirms they received the device, feedback will be provided". It is now almost 8 weeks later with the new billing date coming up. No one answers my e-mails..or can give me an explanation as to why the contract has not been cancelled yet...and with the holidays coming up, I can just foresee that my January bill will have the Y64 on it as well. For the past 10years I have bought all my phones for myself and my family from MTN. After this experience, never again