Phone number not receiving calls

I recently subscribed to TFG connect using My MTN number. However, since the contract was activated I’m unable to receive phone calls. Every time someone tries to call me it says my number is incorrect. I emailed customer care and the only response I get is “your request has been resolved” when it’s not even resolved. I am not sure if they are trying to call me because the number is not going through. I am very frustrated, I need this issue resolved as soon as possible it’s urgent.