Worst service from Rain

I am having the worst experience with Rain. Ordered my 5G router received well in time only for it to work for about an hour. I have been calling them everyday since I received it with absolutely no assistance from their side. They kept telling me about maintenance of towers and when that was sorted I still had no Internet. My router is clearly not working as I even tried it at my neighbours home. I have called for an exchange, was told they would send a technician and I’d receive a message for this confirmation. I still have not heard from them and still sitting with a router that is not functional.