Cell C refusing to upgrade my contract due to sequestration claiming Im under debt review

I have been a Loyal Cell C customer since 2006 and never have I ever had issues upgrading my cell c contracts. However this changed since the end November 2022. I phoned the upgrades department to make use of their promotion to upgrade my contract but was informed that they can not upgrade my contract as I am under debt review. The more Im trying to explain to the consultant that I am not under debt review but was sequstrated 3 years ago and never had issues upgrading my contract during this 3 years the more they repeat the computer promp. I requested to be put through to the credits department but they keep dropping the call or they ask me if there is anything they can assist me with without putting me through. I spoke to my attorney and was informed that cell c was never part if the debt under sequestration and therefore they do not understand why I can not upgrade as I am paying my account via debit order monthly and that the sequestration only affect debt that was place under it and not once that is still paid or accumulated after sequestration. I have tried again on 2 separate occasions to contact Cell C but they keep dropping the calls or have a system issue. My Cellphone is my tool of trade and I cannot conduct my work without it so therefore I need to do my regular upgrade on my phones and have my contracts active at all time. This is causing me a lot of unnecessary stress. I never have issues upgrading before