Extremely Poor Service

I app**** for an MTN contract via the iStore in Centurion on the 20th of November 2017. I provided the store with every possible document that they needed to process my application. I was also very specific that I did not want a new number issued to me, I wanted to keep my prepaid number which was already with MTN. The MTN representative at the iStore submitted my documents to MTN on the 20th of Nov and I received an SMS from MTN on the 21st of November stating that my contract had been provisionally approved and that I needed to wait for the store to contact me. The iStore informed me that a second verification had to be done as I had recently changed my surname after getting married. Apparently, there is only 1 person at MTN who has the ability to do this second verification and he was away on family responsibility leave. I waited for a few days and then was told that the application had to be reprocessed - I have no idea why. The contract was only approved on the 28th of November 2017 - 7 days after my application so clearly MTN's turnaround time is extremely poor or they just don't care to sign on new contracts. I collected my phone thereafter and was told that as soon as I put my new sim card into my new iPhone 8, my prepaid number will automatically convert to the contract. Low and behold, I have a brand new number and not the number that I requested to be ported. I have since asked the iStore to correct this on my contract and this is proving to be a futile task. I have called MTN numerous times and even gone into an MTN store to try and get MTN to assist me but they all tell me that I have to go back to the iStore where I made the application. The iStore have not helped me at all and just keep on telling me that they have logged calls with MTN and that they are not getting any support. I have never experienced such poor service in my life and I am appalled at the response time. I expect better service from a prestigious brand like Apple. I desperately require some support from the iStore as I cannot resolve any of this on my own via MTN. All I want to do now is cancel this contract and for it to be drawn up correctly.