MTN Incorrect Billing

I did an upgrade instore on 10 July 2019 for 20GB+20 for R199 ,the billing department could not apply my discounts correctly and charged me R1 218pm. Subsequently the Retensions Department contacted me due to start a new contract because they could not bill me correctly. I then took out the 40GB+40GB for R299 on 29 Sept 2019. I was given credit for being over billed, I don't know by how much as now one emails or contact you back so in Nov 2019 i was billed R700,95, Dec 2019- R1 197,02, Jan 2020- R1 197,02. In Feb 2020 i was billed nothing as i contacted MTN via their contact centre.

On 20 March 2020 i was contacted by Ayanda via retensions Department, they could not apply my discounts that is why i was being overcharged. Again they offered me a "new" contract because they could not sort out the billing.

On 1 May 2020 i saw the wrong debit order came off again and not R299 i phoned customer care on the same date 4 Feb 2020 Ref ***7 Feb 2020 Ref 288 943 998 Gave my contact number **13 Feb ***525 **16 March ***564 Gave my Contact number **24 March 2020 Ref 290 629 339 **20 March 2020 Ref 290 390 564 Gave my Contact number **13 Feb 2020 Ref 288 634 283 **01 May 2020 Ref 291 554 167 **( I have the voice recording for proof) I have voice recordings where marked (**) from MTN Retensions, which tells me that my contract should be R299 and on numerous occasions i have given my cell phone number and email address so that i could be contacted by Sharika the Manager but since September 2019 Sharika has never contacted me.

Will MTN please email me at *** to sort out this problem which has almost been 1 year worth of incorrect billing. Thank You