MTN - ******* and ********l

MTN phoned me early December 2022 and informed me I can upgrade my number. I agreed to a laptop deal since it was cheaper than my current contract. A few days later I noticed on my bill that I am being charged an early termination charge of R1252.43 .I have logged SEVERAL calls complaining that it is ******* and ********L do deduct this money from my account since I was NEVER NEVER NEVER NEVER informed about termination fee when MTN phoned me to do this upgrade. Every time I phone to follow up on my complaint, I mostly received a new ref number and last few calls that they will listen to the voice recording when doing my upgrade and informed me they do apologise and they listened to the voice recording and agreed that I was never informed about the termination fee. Today (11/2/2023) I received yet another sms that my complaint are invalid, ref number RCO333857. Other ref numbers that I have received are : RCO340909. I have been waiting since December last year for MTN to go and listen to the voice recording and cancel the termination fee from my account