I once set up a 1 month hotspot with Verizon when I moved into a new place that didn’t have internet yet.
After the month, I returned the hotspot to the store and they told me I was all good (in writing too!).
Then I started getting monthly bills that I couldn’t cancel online or over the phone. I repeatedly went into the store and they told me it was a billing mistake and they’d fix it.
Eventually they sent me to collections, my credit score dropped, and a debt collector started coming after me.
It took 2 years to finally get them to stop and to remove it from my credit history.
Verizon is a bad company that doesn’t care about its customers.