Who I have the same questioned this topic

So I got my mom a Jetpack several months ago. She lives in a rural area, and it seemed like the best option. It is eating data like crazy. I keep upping my data and have bought boosts on top of that. As soon as I buy a boost, I get a text saying I'm near the limit. I have disabled automatic Windows updates. I I have told my mom to turn it off at night and to not connect her phone or tablet to Wifi. I ensured  "metered usage." I changed the password to ensure no one else is using it. She does not stream or game. She's 79, for heaven's sake. She uses Facebook and shops on Amazon. That's it.  I am seriously at my wit's end. My monthly bill is absolutely killing me.

What could be causing this? I need a solution, not just a canned Verizon message saying, "We understand your concern blah blah blah." Verizon tech support has been useless. Does anyone else live in a rural area? If so, what Wifi carrier do you use? I've been a loyal Verizon customer for many many years and, unless I can get this issue resolved, I'm switching to another provider. Oh, and no, I'm not going with the unlimited data plan. It's super expensive and, from what I understand, much slower. 1 gig used to be enough for 3 phones and a tablet. Now that I've added the Jetpack, I buy 8 gigs and we hit the limit with about 2 weeks left in the billing cycle.

Has anyone else had similar issues? Can anyone give give me some advice? Does anyone have a suggestion other than Verizon? I appreciate any advice from anyone, other than Verizon as they have been useless. I'm not exactly a techie, but I know something is bad wrong. Very bad wrong.

Thank you