Post in direct with your full account details, and somebody will be able to help you.
Unless it's changed since the last time I checked, Bell's policy is that if there's no usage, then you can be credited back. You shouldn't need to escalate this beyond the first level, but it seems you got a meathead on the phone... just post in direct. The folks who post there seem to be a little higher level than the people answering the phone.