I would say keep calling a couple more times because it did vary for me depending on the agent. The first one I got was $90 for 5gb, then the second time $65 5gb. I told them I'll call back everytime they give me a deal. Took about three calls for me until I got the $65 9gb, I haggled a little more on the third call and luckily she was able to help me out with that deal.
Literally everyone at the bell store when I picked up my phone couldn't believe what I was getting.. $65 9gb with $250 bill credit and the new phone. So I don't think they give this out as often? If you're not in a rush to get a new plan then I would keep calling back until you get the deal you want.