Terrible Service from MTN and DSV

On the 18th of May 2023, I was contacted by MTN for an upgrade. The upgrade was done and I was informed by the agent that I would get the phone in 3 to 4 working days. To date I have not received the phone. I called MTN to enquire about the phone and they then told me that the contract was cancelled and reactivated on 7 June due to a system error. I also learnt that the phone I requested was not the phone that was dispatched. Eventually I was contacted by DSV to deliver the phone on 22 June. Unfortunately due to skin disorder I have I was unable to do the biometrics as it failed. DSV took the phone back. I called MTN to arrange a manual delivery and they have since said that they have provided approval. Each time I call DSV to confirm, they say that MTN has not provided approval. I am extremely fed up as I am not getting any joy from either suppliers. Speaking to the agents who are rude and not helpful. I requested to speak to a senior person to assist and no avail. How can a customer get such terrible service.