Terrible service from Summer mobile, MTN leaving their customers in bad situations

I have been with MTN for many years as a contract customer. On December 10th 2018 I received a call from Summer mobile with an offer for an upgrade on my MTN contract. We negotiated until we reached an agreement and the phones were to be delivered in 14 days.

I informed the consultant that they should send me a copy of the contract by email and I was promised that it will be done in a day. On December 18th the phones were delivered, after which I called Summer mobile again. The number provided went to their receptionist who put me through to the consultants. I was made to hold for approximately 30 minutes, ran out of airtime, called again the second time where i was on hold for about 10 minutes.

Eventually I got through to the consultant and I raised my unhappiness with having to hold for long time and secondly them sending the phones without the contract. After a rude response regarding the long time on hold, I asked for cancellation of the upgrade. She said it will take 7 days, but I will receive a call from them.

By January 5th 2019 I had not received any call, then I decided to visit MTN branch where I was given a number to call. When I called the MTN consultant listened to my and story and then send Summer mobile an email while I was holding. I was informed again that Summer mobile will call me. By the 9th I had not received any call and I called MTN again where I was told that they have sent Summer mobile an email and I should then sort it out with them.

MTN has contracted Summer mobile and therefore it is unfair that they give our details to Summer mobile and when there are problems we are told that we should sort it ourselves. As for Summer mobile, what a terrible service. I just want cancellation of the upgrade.