******** combining of numbers without permission

My partner upgraded our phones in march 2022 and ever since im not able to view my account amounts etc on tge App. The App is also showing on my number his account. When i transact on my number he receives all notifications of what is done. Both the numbers were combined without our permission. When we upgraded we were not told that this would happen and neither did MTN send out any notices advising. When contacting MTN call centre get told that a new system was installed and this is how it works. So in other words "Take it or leave it". Spoke to Portia who logged a complaint , promising to get supervisor to cal back. Portia called back but put to sales who said they cannot help. We want the accounts as they where before the upgrades were done so that we can see separately who owes what on each number as we pay separately. MTN you have violated tge POPI act as you are supposed to get permission first. Regards