MTN Unauthorized upgrade

My two year contract ended with MTN on 12 September 2022. One of their sales agencies contacted me and asked me if I want to do an upgrade on my contract. I advised the person that they can keep my contract the same as it is as I'm happy with what I have. He confirmed that the same contract is extended for another two years. On 12 November I received a SMS showing my new contract is in place and that they loaded it with R370 airtime and no Data. I immediately contacted them on their customer service line and explained to them the situation. They opened a ticket for me and said they will contact me within 48 hours. On 15 November I contacted them again and also send a mail with my complaint number. Again they advised me that they will contact me back within 48 hours. I went to their shop in Lephalale and they advised me to contact the customer care line. Today is 24 November and no one is responding to this issue. This is not bad service , there is no service!