A lot of folks in my area like T-Mobile’s internet service.
Starlink may be a workable option for you as well.
I would say away from the “traditional” satellite Internet providers (like hughes net). Their latency is atrocious, the data limits are tiny, the bandwidth is not great, and the price is crazy.
Edit: just as a note these aren’t “WiFi”. WiFi is a specific set of technologies that are usually only used in a building or small area.
Have you rebooted? If not I’d start there.
Can you call your IT guy? I get that he’s not there everyday, I’m actually rarely at one my customer’s offices, but this is the type of thing that can be fixed remotely usually. And even if that can’t be done " I’ll be there in 4 days" seems like a weird response.