Very poor service received from MTN SA Contract department

My mobile phone was ****** in March 2020. My line was blocked and I was unable to do a sim swop. I was only able to contact an MTN agent in October 2020 and do a sim swop. I was only credited with MTN minutes for 3 months out of 7, my account is paid and up to date. I have contacted the call center to query this an have received very poor customer service as the info I receive differs from one agent to the Next as a lady named Mbalenhle tells me that the minutes are due to me and she will escalate it, the next agent gives me a different story. My account is paid in full I should be receiving my MTN minutes and Data irrespective of whether the months have past or not because I have paid for this. My name is Shantal Naidoo, mobile number ***. Please assist urgently. As I have paid alot towards this account and it is disappointing to be an MTN customer for 10 years and received such poor service.