The only thing Best Buy needs to do for you is to fill out an Apple Warranty Reset Form and fax it to Apple, and it will reset the warranty so you can register. They shouldn't have to call, unless of course they aren't aware of the procedure.
I work for an Apple reseller in Canada (not an Apple Store) and we provide our customers with great service and most of our staff is very knowledgeable when it comes to Macs. If they are a new employee who hasn't used Apple computers, sometimes it takes a little for them to get used to it.
Future Shop (who is now owned by Best Buy) recently started selling macs and they are doing a terrible job at it. I get so some complaints it's not even funny. They don't want to sell them, they don't want to learn them, it's sad because these people are forking out big dollars and they aren't even getting great service.
I had a customer in today who bought an iMac from us back in September, and she had bought a Canon DVDCAM from Future Shop, and she told them she was using a mac. They told her it would work "No Problem"..Well, this model doesn't have firewire, or even USB, so she has no way to sync it with iMovie (she has to buy an external box now, which is about $200CAD to get it to connect to her Mac)..They should have sold her a Firewire model, because even USB doesn't work with iMovie..But no, because of their lack of Apple knowledge, instead of selling her a comparable model for about the same price, she's screwed..She bought it at Christmas time and only got around to trying to edit it now..I feel bad for her..