Contract Cancellation

Six months ago I upgraded my MTN contact telephonically everything went well. I got a call from DSV to arrange for delivery, I’ve waited for the DSV 3 times, means three weeks while DSV claiming to have came to my work place for delivery and they can’t find me. I’m working at a Department where the flow of communication from the reception I give it 10/10, okay apart from that my phone is always on waiting for they call. No phone call I got from the driver or may be he assume he will find me by the gate I don’t know. I decided to buy the phone cash and cancel the upgrade. I called MTN for cancellation, I wrote to MTN for cancellation, thou nothing happened I speak today serve as a six month MTN debiting my account for a phone I don’t have, I've been calling MTN since lock-down level 5 till today nothing is happening, and don’t want to name and shame. MTN can you please sort out your house and stop debiting my account .