OP... I went through the same issue yesterday with VZ. Changed the plan, because of a screw up ON THEIR END, and got the email that said 'no surprises' and sure enough, next month's and this month's Bill both jumped ENORMOUSLY.
I've been with them fifteen plus years, formerly with UDP and I got a supervisor on the phone, better than the first supervisor who messed things up, and received three new emails, each one with the prices dropping on both bills, current and next month's. They kicked in some good credits... to make up for the time I spent with them on the phone.
Honestly, I'm ready to jump to T Mobile and their $70.00 all inclusive of taxes, unlimited plan, coming out today. I'm hesitant due to the problems T Mobile has been having in Denver and the sparse rural coverage.
Verizon upon hearing I've had enough of their b.s. came back to me with 7GB carryover for $50.00 a plan that has not been announced yet. That's going into effect on my account next month. I've got four channel high speed wifi at the house/office.
You've got to fight VZ at every turn and I told them to cut out the crap with the Nickel and diming... or I'm gone.