Internet? What internet?

So, 2 months intermittent internet. Finally speak to someone from technical side (Melvin) very friendly, Friday, 21 June 2024. Says they need to send me a router that mounts outside, will send early the next week. Friday, 28 June 2024, only the new simcard for the new router arrives and they disconnect my old router. The new router only arrives today Tuesday, 2 July. So been without any internet since Friday, nevermind the intermittent and slow internet the past two months. Fine, get the router set up, pick up signal, connect the inside router. My phone connects to the 2.4ghz network, nothing else will connect, not the TV, not my husbands phone, my phone can't connect to the 5g, it keeps throwing us out. I am now on the line for the 3rd or 4th time, signal keeps cutting out. Been on the line 20 minutes, another 20 minutes, then 10 minutes. Now holding for another 5 minutes, because asking for a call back is like a no go I've noticed. I have no internet, paying for a service that I have to keep phoning and they keep dropping calls. Their network is experiencing a large call volume because they can't provide a service