MTN not replying to complaints email in 3 months despite several follow ups

REFERENCE NUMBER ***, Account BA***! I am a customer with MTN for 10 years and keep on renewing my contract. End of November 2020 my contract expired. Mid December 2020 I renewed this contract. Beginning of January 2021 MTN charged triple my contract rate for December MTN (I had a contract with discounted data). I was told that this happened as I renewed my contract after it expired. I understood, however I asked in my email if this rate could be reduced as I renewed my contract in the meantime. Plus MTN didnt notify me that my contract is going to end and I will be charged triple the amount. I was told that this has been escalated to the "complaints department". Since then I followed up several times and was told that the matter is still being looked into. It has been 3 MONTHS now with absolutely no feedback. I worked in Customer Service many years and I am shocked that is is how I am being treated after 10 years with MTN. No even an answer to my request, nothing at all.