MTN Store messed up

I really have to say that once again I am not happy with the service, not only waiting on a call with the call center for like 40 Mins just to get cut-off but this wouldn't have happened if the MTN store didn't mess up in the 1st place with an upgrade.

Almost 2 years ago I took out a contract with MTN that was on promo, getting the 2 samsung devices for R999.00 (whole package was Samsung S10 and Samsung S10E where the main number will be on a 'Made for me S' and the other number will be a top-up R55 which was free with the deal)

So I phoned in to Hartbee****rt Store as I am not too far away from it and I have been acquainted with some of the store staff and managers over the years signing deals i took out in the past. This is where all the wrong was done... Both these numbers (main number and the R55.00 sim) was due for an upgrade and they decided to upgrade the wrong number. Both these numbers I have never ever had in a cellphone nor do I know what these numbers are... Literally both numbers starts with a 060... and the rest I never bothered to look at. This was really a case where it was REALLY not my fault as I have said numerous times I would be saving over R700.00 by doing this upgrade to a data and modem package for my wife. I even confirmed that with management that they overheard me saying this.

Now I have ended up paying R179.00 more on the my total package. MTN Hartbee****rt cannot reverse the transaction so they can process the right upgrade to the right number. They in-fact want to upgrade the other number to the smallest deal MTN has but still will be liable for R29.00 per month on that deal. After I said we can go through with this they said on Monday that they are having server issues and they will contact me in the meantime when it is ready. They waited literally until yesterday till they notified me that is in fact on the SAME day as my billing date to sign the documents. I really need help as I feel this is pretty unfair and might have been deliberate.