Disgusted in MTN

I am posting this on behalf of my aunt, Mrs MM Venter. She is 83 years old. She took out a MTN contract Jan/Feb 2022. She stays in Mosselbaai. Her number is ***. She does not use Facebook or Whattsapp. MTN blocked her phone saying she used data worth R12 000. Which is impossible. She just uses the phone to make calls. MTN Mosselbaai says the cant help her. My mother went to our brach in Kimberley who is also not able to assist. What if something happens and she urgently needs to make a call? She is 83 years old and should be able to contact someone immediately, but thanks to MTN she is not able to. Really MTN is this how you treat your elders? This is really disgusting to say the least.