Sinking to the level of or below a terrible company does not put one in the right, it just makes the entire world just that much uglier. Be better than those who would just as soon screw you over than give you a fair shake, not worse.
Unless you're paying for business-level service with the rights to share a connection, this is a clear violation of terms of service, and worse, you'll be on the hook for any illegal activity they might conduct online under your account. There's no safe harbor protection if you're reselling consumer grade internet.
This isn't to say that this is a good way around the distance issue, and I'm sure it's within the realm of possibility to set up two personal accounts at your current address with some effort, one in their name... but.