Shocking service once again

Vodacom disappointing once again. I took out a new SIM only contract on the 24th of November, it was a 5gig day and 5gig night for R99. The SIM card was only delivered last week and all was well. When I received the SIM I then logged onto the app to check the data balance and contract amount. The data looked okay but the debit order amount was R197. I then called into the call to query this and a ticket was logged and I was given. TAT of 3-5 days. Today to my surprise, I keep receiving text messages and emails stating that my contract has been changed over to prepaid. I don't know why they would do this. I then called the call center again and was told that the an inquiry which was logged was to cancel the contact. I then advised them to reinstate it but for the same offer I got which is R99, but gets told stories. I need this to be resolved please.