Pathetic service from Summer Mobile and Mtn

On the 15th August 2017 I was contacted by Fahmida Isaacs a representative of Summer Mobile informing me that i was due for an upgrade. I accepted and proceeded with the upgrade, only at the end of the conversation i was informed that delivery of the cell phone could take 2 - 3 weeks, my response was then I might as well go to an MTN store where I can receive the phone immediately, the lady assured me that MTN is providing this service not to inconvenience their clients waiting in queues, by the 1st week in September I have not received my new cell phone , I then contacted Summer Mobile and was told that MTN had changed their courier company which is causing a delay in the delivery, i then contacted MTN to query the matter, then referred back to Summer Mobile. Being unhappy with the service delivery, I requested for the upgrade to be cancelled, I was told that it will take 6 working days for the cancellation to be processed of which i was not happy with. About 2 weeks ago i was contacted by a representative of Summer Mobile informing me that they could not trace where the cellphone is and she thinks its best to cancel the upgrade, which i then said why was it not done at the beginning of September when i requested it to be cancelled. She was laying blame to MTN saying that MTN do not contact their clients as they are not prepared to listen to irate clients, so they are passing the buck to Summer Mobile. Being a loyal customer to MTN for the last 15 years, I contacted MTN again making a query about this matter of which i insisted to speak to a manager. Instead i was put through to a supervisor who checked on the amount of times i called in querying this matter. I was told by her that she would forward an email to the relevant department to cancel the upgrade which could take 24 hours. She also said i would get a message on my cellphone confirming that the upgrade has been cancelled. After 24 hours i did not receive a message and decided to contact MTN again, this was on the 27th of September 2017. I was then told that they received an email back from the cancellations department stating that the cellphone has not been returned therefore the upgrade can not be cancelled. When i questioned the supervisor as to where does this leave me, I was again referred to Summer Mobile. I tried to contact Summer Mobile once again requesting to speak to a manager, I was put through, held on for 15 minutes and nobody answered the phone. There after I called 3 times and nobody answered the phone. I am now sitting with a contract which expires in April 2019 without receiving any new cellphone and i will be billed at the higher rate. So between MTN and Summer Mobile I am being shoved to and fro with no solution to my problem. This is the worst service i have ever encountered.