Very Bad Service and Communication

Hi Everyone I have been with Mtn for more than 7 years and I do spend a lot of money with them. I got a new upgrade phone(Hawawei P10)in July 2017, the phone was great until the camera did not want to work. I gave the phone in at the Vryheid branch 23 September 2017 they send the phone for repairs and will let me know. So no one got back to me, I went to the store in the first week of November 2017 to ask about my phone. They said they will follow up and let me know, so I when again to the store as no one got back to me and when I phone them they don't answer their phone. They said they will give me a new phone as they can't repair the old one. The store manager said they don't have stock he will order and let me know as the stock arrives. A week later I phoned the store manager (he did not got back to me) he said the phone is in stock I can come collect. I got to the store the manager said he can't give me the phone as the warehouse delivered it to me so they have to send it to me again. So he did not phone to let me know before I wasted my time to drive to the store to tell me this. I have been waiting for 3 weeks and still no phone every week I have to phone the store manager to get update. Al he say's is they will send the phone. I have spoke to the regional manager and to the head office and to the repairs centre and no one can help me they just say the store must give me a new phone but the store and warehouse are up to **** it they cant even send me a new phone. Please help ...