Dissatisfied with ILLOGICAL Cell C

My husband and myself have been a Cell C customers now for well over 10 years. We were offered an upgrade over the phone in January. We went in store to look at the phone options. My main stipulation for the work that I do was for a good camera and it being important to me for family photos and for an upcoming trip to the bush. We were advised to move from a Samsung phone to an OPPO and specifically the OPPO A54s. We then found out that there was a new policy introduced at the end of January which threw a massive spanner in the works which I am not going to highlight now but it did cause me to want to walk away from Cell C ! I was flying to Durban during the March school holidays and because of above mentioned issue there was a delay in getting the phones. As my husband was joining us later for the few days in the bush , we settled on the fact that he would get the phones and be able to use his phone for the photos , my Samsung phone having a storage issue. And once I returned to Cape Town I would then transfer phones. However we were both very unhappy with the quality of the photos the camera on the OPPO A54s took. When we returned to CT , I took my unopened box with my OPPO A54s into the Cell C store. My husband having used his had no choice but to keep his. I requested returning the brand new , untouched phone and upgrading to the OPPO A74 and paying an extra R100 per month. As it was outside of the 7 days since I got it ( I had been in Durban ) it had to be sent away to Johannesburg so that they could take it apart and make sure it was not damaged or parts ******. All part of procedure. I waited 3 weeks to get it back. It was confirmed that the phone was in good working order and that there was nothing they could do despite the fact that I am talking about being dissatisfied with the quality of the camera. The phone is brand new and untouched . I am asking to pay R100 more to Cell C ! They will make more money off me! It is totally illogical to me that they won’t let me return it and get the better model with the better camera. Especially being a long standing customer! We tested the camera in store and it was agreed that the camera is not great. Not for what I need it to do. The OPPO A74 is much better. I can’t get hold of anyone who has the authority to help me with this. I don’t want to be stuck with this phone for 24 months and it is not delivering on what I requested as a customer. I am not impressed with Cell C at all and it makes no logical sense ! I am desperate for someone to speak to high up in the chain - something which seems impossible to do.