MTN *****!!!!! NO assistance from MTN

On the 2nd of February 2022, I received a phone call on my MTN cellphone number, from a number claiming to be from an MTN shop in the Norther Province and he told me that a Mr. A Lategan had tried to SIM swop on number and he now needed to run a security test on my number in order to secure it once again as the system picked up that it was possible *****. I needed to read OTP's that he was sending and kept reassuring me that this was all part of the test and nothing would be actual and that it will all be empty. I then noticed on the very next morning that this person had purchased Airtime and Data as well as activated datasharing on my account to the value of R4600 I immediately called MTN and asked that my number be suspended. I also immediately opened a ***** case on that 3rd of February however I have STILL not heard anything back. I have contacted MTN every 2 days since the incident and I keep getting the same answer. ***** department is still looking into it. And when I ask can I speak to someone in ***** the answer I get is please just keep calling the call centre number. Meanwhile the end of the month is looming and that BIG amount is sitting on my account waiting to be debited from account. I refuse to be held accountable as I have opened a police case as well as have a written and signed affidavit! I would love it if I can get feedback and if the amount can be immediately cancelled and my account be closed with MTN as this has been the most invasive and impersonal service I have ever received. Please contact me on the alternative number that I have given 3 times for contact to be made.