Poor network service

I was using Rain network for years with a plan that was off peak and was happy with it until I was upgraded to the unlimited 5G that is when the problem arised. Ever since I received the 5G router in September last year it always disconnects and I constantly have to call them especially if the power goes off when it comes back I have to call them to connect me again and again the last over a week ago I got disconnected they said I will get a new router which was delivered on the 24th and still didn’t get connected then I called yesterday they suggested I bring the new router to the nearest Rain store at my expense which I did. It worked when I got there and when I came home it didn’t. Called them again with my own airtime and they are saying they will send a technician and I’m tired this has been going on for so long. Every time you call you wait for long.