Connected without internet on all devices

I recieved my 5g router and sim on Friday 22nd of April. It worked for a few hours. Since Friday I've been waiting to recieve feedback as to why it suddenly stopped working. The support call center is useless, all they say is that on their side they don't see any issues and that I'm connected to a network tower 500m away from me. They told ne they have escalated the call with network department. Even now I'm still waiting to hear from them. This is 3 days later. Really angry and disappointed in rain.