I hate to say - DISATISFIED WITH with CUSTOMER CARE RESPONSE and VERIZON in all for first time.

Question

I am currently on National 900 plan on Motorola Droid. I switched from AT&T primarily because I love to use data on mobile. Verizon provided me the unlimited plan. I was a very happy customer with Verizon untill now.
Scenario -
Today, I called up Verizon customer care executive to see why bill for the month was not readjusted. Can anyone believe it its staggering $1137.73 [Roaming charges 1019.19].
Since this January, I am visiting to Canada. On first visit in January, I called up customer care to see what options I do have to use my phone in Canada as I use it in US. Verizon had a wonderful plan - just the monthly data plan is escalated appear. 30-40$ extra than the normal appear. 29.99$ plan. I happily added that plan before visiting Canada. While there is Canada, I did get notification couple of time that I am exceeding data limit but again checked with customer care later - they readjusted the bill as that was 'FALSE ALERT' as I was on unlimited data plan while roaming as well in Canada since I paid the additional prorated of (30-40$) for period of my stay there.   
This equation worked for first and second visit - Unlimited Data while I used to get FALSE ALERT.  
On my  third visit , things changed - Verizon stopped providing the unlimited data services. I called up as usual before this visit. Customer care executive said - you are set to go to Canada now. I was not very specifically told on call that the rules have changed now and there is limit to data usage while roaming. During this visit also, I got the alerts - I assumed this was also a FALSE ALERT like prior one. 
But this time, it was not FALSE ALERT, now I charged with this fee. I raised my concern and called up customer care appear. 10 day before [today is March 6th], they assured me that it is going to be re-adjusted ONLY for this time. And, they also asked to check account after 48 hours and if not readjusted please call. But, I checked my account today and it was not readjusted. So, I called up customer care executive for half an hour -- not willing to listen to any logic of mine and he said politely 'SIR, WE CANNOT READJUST YOUR BILL' . I am still trying to figure out where is my fault when I was not told DATA PLAN HAS CHANGED FROM THIS VISIT.
I hope senior management will look into this matter and re-adjust current bill. It's due this March 10th. I would appreciate any positive response prior to this so that I can pay the bill and BE A HAPPY VERIZON CUSTOMER.
Sincerely,
Manoj K. [removed personal information]

Answer 1

I called them back yesterday night, not willing to listen my story. Sir we sent you SMS notifications. But these notifications, I also got when I had unlimited plans on first and second visit. Then customer care told SIR you don't need to worry - but this time I should have been very specifically told rules are changed before changing my plans which I wasn't. I was under impression that I am on same unlimited plans.
A job not well done in COMMUNICATING TO CUSTOMERS and using that an opportunity to OVERCHARGE $1100 - INSANE for one month bill. None of my fault. SMS notification is no communication as earlier SMS noitification were false positive and bills were adjusted as I was on unlimited data plan.
Now you change the rules and send SMS Notification; RULE CHANGE, one is not aware of.. ANY NORMAL person will treat SMS notification as FALSE ALERT.. isn't it??