MTN unable to update ID for almost 9 months, and counting...

I have been battling to update my profile's ID from passport to ID for over half a year now, and every time I visit an MTN center I deal with a different consultant. I have frequently been to the Century City/ Canal Walk branch(next to the Shell Garage), and also to the N1 City branch, other branches coldly or blatantly informed they are unable to assist. Each time sometimes give me attention, I have to explain my case over, and we seem to be making headway but they keep telling me to come back to them on end with no traction. This is now frustrating and costing me as almost each week I have to visit an MTN to try and resolve this issue.

I am a non-citizen and opened an MTN profile(I can supply account number as and when needed) in 2022 using a passport. However, in the interim I obtained Permanent Residency and a RSA ID. I was then compelled to change/ update my profiles to reflect the RSA ID, ie, Bank Accounts, Store Accounts, Driver's Licence, etc. However, my last stop was MTN and they keep throwing me around with excuses and 'load-shedding' where consultants push the case to the next one. I need my MTN profile to be updated to reflect the RSA ID and not the passport(in their lingo they say it needs to be linked to my ID) as this is no longer applicable in my case. The other complication is that I no longer need to use the Bank Account linked to the passport, and since September I've just been paying bank charges to keep that account afloat for MTN purposes.

My worry, or concern is how difficult is it for what I considered SA's top mobile telecoms provider to just update an ID field. In my village-man mentality, this seems like a very trivial task, but it has taken me now almost 9 months of frustration. They have given me a list of a million requirements as scapegoats which I have supp**** timeously, and now I am at wits end wrt the way forward. Please assist.