Call customer service at 1-800-922-0204 from a landline or *611 from your phone and request they add a hotspot block to those lines on your account. You might be able to add it yourself through your MyVerizon account online.
I'm most definitely NOT a VZW employee. If a post answered your question, please mark it as the answer.
I would love to help with any blocks you need to do on your account. Please check your private message so I can help you.