Shocking service and unhappy customer

Wow what a sad dealing I have had to experience after canceling my cellphone contract two years later and my number no longer even on the system getting a call from debt collectors saying I owe MTN money.After endless back and forth and unsuccessful to there branch with no answer to why I have been handed over.Thinking that when you cancel your contract in good faith one expects the consultant will do the correct procedure and give the necessary information required as that is there job to help one.After calling the debt collectors to be told was handed over by MTN and asking what the amount is for was told to call MTN. So now I am paying this unnecessary money I definitely can't afford. Then last week Thursday my daughters phone was cut off with no warning. Only to find out when going to there branch to query whats going on to be told that she hasn't done her upgrade and her contract is up which was due 25th November for upgrade saying they charged her for data which she has used in the time and not evening contacting me just bam handed it over and getting call from attorney. It's sad that through not being notified in regards to ones upgrade I must be dealt this hard hand especially in this sad and terrifying time the world is facing with covid people loosing loved ones and there jobs.I have been a customer for many many years and had three contracts at once time now I have two at same time and was never a problem. My daughter is a student studying and urgently needs her data and this has now put a hold on her studies and keeping her up.Its not that we didn't want to upgrade its exactly what we want but not being notified this is sad after me being a loyal customer for years I'm really devastated at the way things have been handled.