7-21 but no hope

Hi I made a purchase through MTN direct which was a Huawei 10 handset with supercharger. 2 months down the line I experienced difficulties using the supercharger,the phone took 8hour to be fully recharged than the usual estimated time of lessthan 2hours. I booked the phone in at my MTNstore Nd was told it would be send for warranty assessment.

After 7 days I then made a followup call and was told it was approved I must wait for mtn direct to process the claim for a new phone.

Today its over 26 days waiting for MTN direct to issue some reference number so that it can be dispatched. The phone was brand new im still paying for it but cnt enjoy the benefits ..... Can they just cancel my contract and reimburse me?