Bad Service - Lost my Phone

I took my phone into MTN Mall@Reds on the 5th August 2017. This is the 2nd time my Sony Xperia XA has been to the repair centre in 6 months. I phoned the MTN Mall@Reds on the 1st September 2017 to follow up on my repair. Ashley said that my device is repaired and will be collected, but they have a new courier so there might be a delay. I phoned again on the 8th September to follow up to be told it was never collected but will be collected today (8th) I then popped in at MTN to follow up again and they said it was collected they are just waiting for the phone to arrive. I phoned again on the 12th September to tell me the phone is not repairable and they are waiting for a new phone for me. This then became a concern because is the staff playing guessing games or are they really investigating what is going on. My experience they guess. They Courier lost my phone SURPRISE delivered to the wrong repair center apparently. The perfect client, supplier relationship both parties do not seem to know how to read. The couriers cannot read the address on the Waybill and the Staff cannot read the results on there computers. I have now sat without my phone since the 5th August 2017 to be told owe we found your phone it will be sent to the correct Repair centre and ask them to look at the phone this is now a Month later. I want a credit for this phone that I have not had for a month. I will pay for my Contract but not the phone expense due to you peoples incompetence. I suggest you train your Manager Mpho on Client services that she clearly does not have or care to have, when you arrive at the store she hides in her office never sees her customers that pay her salary. I have been in this store a few times with problems and have asked to see her and everytime she is too busy to see her customer, she makes it someone elses problem. Is this how MTN Managers are trained. I want my phone by Friday the 15th if your people cannot ensure this phone is fixed and delivered to the store by then I want this phone replaced. I was 3 days out of my 6 month contract and I was told this phone cannot be replaced it is now the 2nd time it has been in for repair.