Sprint charges $500/month EXTRA fee for going over 5 GB, when I have a UNLIMITED MiFi plan

ATTENTION Sprint MiFi users.

Sprint charges me $59/month for UNLIMITED MiFi.  They just added $500 EXTRA this month for the amount of traffic I used.   I signed up one month, and the next month they turn my UNLIMITED plan into 5 GB /month, then charge me $500/month for going over 5 GB/month.  Then they say I can't cancel or they will charge me a $180 cancelation fee.  

That is the ultimate bait and switch -- especially since running dropbox.com means it will immediately go over 5 GB (so the product is 100% unusable).

After being on the phone and ~5 escalations, they finally cancelled the $500 month fee and let me cancel the contract without paying the $180 cancelation fee.  I'm glad I didn't need to look into a class action law suite.  I'm glad Sprint did the right thing at the end of the day.