MTN, identity theft. Inside job

Worse network eve. After years of being a good customer now they treating me like a ********.. I have a data (router) contract with Mtn that was renewed august 2021 (after I struggle to end it for months) that costs me R299 per month. My initial data contract I had since 2019 (was paying R250 per month). It was due for renewal last year May/June and renewed around august, last year October 2021 after MTN debited around R1800 on my account I was made aware that someone had **********ly took two new contracts somewhere in joburg using my ID documents (I don’t stay in joburg. I work/stay in Mpumalanga) and I have always used my local MTN store. I reported the matter to your call centre and was advised to submit an affidavit and my ID copy for investigation. I submitted the documents and waited for a response. Yesterday the 3 January 2022 I made a call your call centre to enquire about the investigation. I was told that the investigation centre had said the didn’t detect any ***** on my case because the ID documents that was used was mine. I need help with the re-investigation.