Bad Service

I am a vodacom client and have been for more than 20 years and dealing with their aftersales centre has been a nightmare for the last week. I upgraded a contract on 15 December 2022, called them on 16 December 2022 to advise that I changed my mind. The 1st person that I dealt with told me that they couldn't cancel, I had to reject the delivery iow not take take delivery of the parcel. I was concerned that I would have no guarantee that the device would be returned to the vodacom warehouse by the courier service but I was assured that it would be, now 8 days later and after my many phone calls to vodacom since 21 December 2022 when I rejected the delivery, I have been promised call backs and that they would follow up with RAM, the courier service and I still have had no feedback, have no idea where the device is, in the meantime the contract has been upgraded and I have no other recourse