Poor Workmanship

I am dissatisfied with MTN, in this age of cyber *****, cloning they can't seem to resolve my issue. It is now more than 3 months that I called and informed MTN that my number has either been hijacked, as I do not receive messages and calls on my number. I have called the 135 number numerous times, creates tickets , the issue got escalated and reescalated and then deescalated, no success. They refer me to the device manufacturer. I went to the device manufacturer, removed the Sim, put a different Sim in then called and the call went through. Took my MTN sim put into a different device, results: no calls, no messages. Followed all their codes BUT no success. I did Sim swaps with the hope of getting back online, but no. My livelihood is affected by this, my business is affected by this. MTN is a huge failure. They keep telling me that my Sim is fine, yes, the Sim is fine. Have you ever investi***ed my number to get to the bottom of the issue. My cell number that i have been using for more than 15 years, is only capable of giving money to MTN(data and airtime), I'm being prejudiced by the inability of MTN to resolve this issue, the call centre people are hopelessly out of their depth I'm losing money. Somebody else is using my number, receiving calls and messages. The whole of Oct-Dec 2023 and we now into January 2024. I have written emails. How can you not find the problem MTN. This is YOUR number, assigned to Me, how can you not solve the issue. Where are your data analyst/investigator to get to the bottom of this issue. This is realy unacceptable for a company of MTN's stature to fail to solve a customer's issue, an issue that they are suppose to be the experts in. Clearly they are not. 3 months and counting with out receiving calls and messages. But they keep on taking money from me through this number. I am frustrated and very angry.