No signal no service, proudly south african

i got a new router in March 2024 on a 50 meg un capped. this was an awsome special and everything worked super good untill last month. When Uitenhage got flooded the wifi disappeared. Since then i have been logging calls on 082135. No response let alone fixing the problem. Today 20 days later and twenty seven customer care consultants later i decided i will phone their head office in PE. Had to wait more than two hours for a call back but yes it happened. This gentleman head of signal something said no worries sir we will have this sorted. That was at two this afternoon now its six o clock. No answer no phone call again but to make it worse now the wifi is not just very slow it is non existent. I have been nice, angry, rude and even screaming like a local Caren. Still no hope on a glimmer of signal. Any one out their with advice?