What is your experience like when your broadband has gone down?

I’m having a really frustrating time with my broadband this month. At the beginning of the month it was going down every five minutes and apparently they sent out an engineer to fix a fault on the line. Yesterday it happened again and I was told it’ll be fixed in 72 hours. Still doing it today, but I don’t understand how they can quote me a fix within 72 hours when tomorrow is the weekend and a bank holiday? We’ve only got the part fibre if that matters for how long a fix could take. Got a lot of work I need to do that I haven’t been able to get done the last two days. Been looking at the 5G routers instead but don’t know how to find out if my area is in a good spot for it with whatever brand.