Verizon Wireless/Digitell Charge more than agreed upon in the store. Flagstaff, Arizona

I was quoted $154 a month for 3 phones total out the door price including all taxes, everything.  I agreed to this because I was paying $164 a month, but had unlimited data.  We went down to 10Gig.  I got my first bill and it was $249.  I called customer service and they said they would fix it.  They didn't.  I called back again, nothing again.  I called again, and they got the bill down to $189 a month.  I told them I would not pay more than we agreed to and I certainly was not paying more than before with less data.  They told me there was nothing they could do.  I told them I would only pay them $160 a month, not a penny more.  That is exactly what I have been doing, and they continue to carry an outstanding balance.  I also talked to an employee at Bath and Body Works in the same mall and she told me that the did the same thing to her mother, charging her $20 more than they agreed to in the store.  They are crooks and I am just waiting for them to turn my service off so I can go to someone else who is not so crooked.  They need a class action lawsuit filed against them.  You think they would have learned.  Class action lawsuits have cost them, I believe $21 milllion in 2006 or 2008 and another $37 million in 2012.  I hate that the big companies think they can just screw the little guy.  Stay away from Verizon.