Unfair treatment by Cell C

I have 2 contacts with Cell C, 1 is for iPhone XS Max, 1 for 50GB Router, which I pay every month R1600. On the 11th of May 2019, my WiFi stopped working, I reported the matter at Sandton Head Office, on the 18th I had to drive to their office for them to check what was the problem with router they told me that it’s their fault it’s network problem, because the LTE something wasn’t working for many clients I was told that by Monday the 20th the sim will be ported to prepaid in order for me to utilize 34GB that was remaining out of 50GB, today I received an email that I was declined to be ported on prepaid and to get another contract because of my credit scoring, but the fault wasn’t not mine, because I’m their loyal clients and it’s not my fault that they sold gadget that is not working, then I had to reverse a debit order because I cannot pay for a router that is at Cell C, and I only remain with SIM card which isn’t working.

I would like Cell C to approve my SIM card contract for 30GB day and 30GB at night, I don’t wanna hear their reasons that state that my scoring isn’t good, I’m not applying for a new Contract here I have already have an Contract with them, so if their network isn’t working and I was advised to cancel the contract and motivation will be forwarded to Senior Managers for approval because for me not having my 50GB it doesn’t include my scoring, I’m paying them R1600 every month that means I can also afford a contract of R289, if it wasn’t for them I was going to continue with my contract of R359 for 24 months of 50GB

This was not a new contract it was just for Cell C to port another contract into the useless SIM card that they gave it to me. By their response that I was declined to get a SIM card, I reversed the debit order, because I didn’t see a reason for me paying for a SIM card that doesn’t have a network, and the gadget was taken to me. Is that fair for me as a loyal client??????