when you told her what you wanted you implied consent to it but when you found out the terms of your plan will change, you renege on your consent.Later, I was talking to this CR lady named S***h. I thought she was nice since she apologized about their system glitch on drop calls. I told her what I wanted. Found out she didn't even know such super 6gb plan exists until I told her to look at their website, but after a good min, she was cool as throwing me this "Sure, I can do it" quote. I was surprised as this was too good to be true.
Yes, they were wrong not to reset your account back to before the changes but are you surprised.
Most old plans are grandfathered and any change to any portion of your plan allows then to cancell or delete credits as they credits have been removed from their website.
Next time before making any changes find out what it is going to cost you.