Starbucks has its own support forum. You could also contact them directly or deal with a manager at a store. I know they get a lot of hate, but unlike a lot of indie coffee shops, they do actually go out of their way to take care of people.

My only gripe with them is that a Starbucks card is useless for a corporate traveler. Loading up a Starbucks card, even if you only use it for business, with a corporate credit card will earn you unemployment benefits pretty quick. They need a corporate program.