Cancellation of Cellphone Contract

I am sure I am not the only customer that has experienced such poor service from Mtn regarding this particular situation. I was contacted by Anita from Summer Mobile as I was due for an upgrade. She explained that to make the process more convenient for me as the customer, she could do the upgrade via the telephone and my device would then be delivered within 10-14 working days. Upon delivery a copy of ID would need to be produced. My upgrade was then processed on the 8th August 2017. It is now 3 months later and I have still not received a device. Therefore my upgrade has been active for 3 months but I have still had to use my old device which is totally unacceptable. I have contacted summer mobile only to be put on hold and then the line being cut, I have emailed and contacted customer care and channel queries SO many times but get no help or response. I have gone in store only to be told that there is nothing that can be done about it. It is absolutely disgusting the poor service I have received and I’m sure a lot of other clients too. A process that was meant to be more convenient has been the furthest thing from. I have never received such bad service from Mtn before! I am still awaiting assistance!!