unstable internet

hi everyone! I'm begging for help since zoom doesn't even offer a support chat with a human. I've been sharing date visa personal hotspot for a week and nobody can either hear or see me on zoom. the same problem from my side- I don't hear or see anyone. we have to take our lessons to another platform. I don't understand why this is happening because I used to not have a wifi connection and it would still work just as well. also, with a couple of meetings it was limited to 40 mins (I have a pro version!) I am really powerless and hopeless. I don't known what to do, I simply can't use zoom