MTN - internet connection (wifi router)

I've been having issues with my wifi router since 24/12/2024. The error message I got was "connected without internet connection". I have been calling 135 ever since. I have spoken with quite a few consultants without any success. I took the router to the nearest MTN branch on 26/12/2024 and received it back this morning with the same issue. I was on the phone with another consultant half an hour ago and she was supposed to call me back and I am still waiting. As a paying customer I am highly dissapointed in the quality of service I'm getting! I did'nt want to come to this platform, but you leave me no choice!