Super unhappy Cell C customer

I am due for an upgrade on my current contract with Cell C. never had any problems before. They ran a special from 1-3 April on an Iphone 8. I requested to be upgraded to that package. According to them the system froze during the late afternoon of 3 April and they could not complete my request in time. In the meantime they have already migrated my contract to a now limbo state costing me a lot more. I do not have any of my previous benefits nor do I have a new upgraded phone or contract. After more than 20 phone calls and 3 visits to the store I still have no answer as to what is happening with my contract. They misled me into thinking that I will get a better upgrade, they convinced me to migrate my contract to a non-existing package and I still did not receive my new phone. According to the staff a t the store they have sent emails to the head office but have not had any response. I have requested the head office to call me, but still nothing. After calling them a few times they simply informed me that I must just wait patiently because MAYBE they will have new similar deals that come out next week friday. In the meantime I am paying way more than what I was paying on my previous package. At this stage I have lost all my previous benefits, and was falsely made to believe that I will get a better deal from them. I would like them to get back to me regarding my "limbo" contract a.s.a.p!!! I have never had such bad service!