Last February my Rogers bill grew from the standard $115/month to well over $300 due to data over 25MB. I called and escalated to a manager to discuss the misuse of the term "unlimited". The charges were reversed and in turn were given 3 months of real unlimited data, as well as $20 off the next 3 bills.
I took full advantage of my unlimited service by using the bb modem on my laptop. Exceeded 500MB in May!
Although the "win back my business" initiative had to come to an end, it worked. I have chosen to stay with Rogers.