Emergency internet

We have had Three 5G broadband at home for about 3 years now and the signal is good, we we generally get 300-500MBit connection.

Unfortunately, we woke on Tuesday this week to find that there was no connection. The Three Network Checker acknowledged that there is a problem and chats with the reps have now confirmed that it could be a WEEK to resolve. This is a disaster, as aside from anything else, my partner works from home!

Could anybody please recommend a temporary solution. I was thinking of a relatively cheap router with a SIM for another network but I don't know which of the thousands on offer are any good.

We live in Stoke-on-Trent.