Phone Repairs - NO REPONSE FROM THE REPAIR CENTRE

I sent my HTC Desire phone in for repairs on the 31st October 2017 and the phone is still not yet fixed. When phoning the cal centre they DO NOT KNOW what is going on as they only use the system to tell you what is on the system. When I called them on the 2nd November they said the phone had been sent to external repairs. On the 6th November I called again and they still had no update, on the 7th November I called CTDI, the external repair company, they said the phone has been repaird and sent back to MTN, I called the call centre and the phone according to the system was still in transit, this reason was given to me till the 10th November, I howevere then went into the MTN repair centre and they told me they will check if the phone is in the repair centre, the phone was found and then a qualty check was being done while I waited for about 30 minute. I was then told the phone failed the quality test and has to be sent back for repairs as the front camera was faulty. On the 12th November, I called CTDI and they told me the phone was awaiting parts and would only be ready on the 30th November. I called the MTN repair centre to follow up on the repair late afternoon on th 29th November and told them I need to know the status on the phone, they said they will escalate the problem and they will get back to me, I then called the call centre again on the 30th November and was told it takes 48 hours for a resopnse and they told me I only called in on the 30th Novemeber to escalate, and now I insisted on speaking to a supervisor (Kabelo) who told me he will send an email to follow up for me and come back to me. HE DID NOT COME BACK TO ME. I then called again on the 1st December and spoke to Kabelo again and he said he will follow up and come back to me, he did not come back to me again. On the 4th December I called CTDI and was told the phone was repaired and that it would be sent back to MTN, I called Kabelo at MTN again and he said he will follow up and come back to me. He does not do what he tells his customers and I dont know when I will get my phone back or even if they will call me to give me feedback. The call centre is hopeless and a bunch of unwilling people, they are not willing to do anything to assist a customer only to tell the customer what is written on a screen.