You universally can't transfer iTunes cards to Apple Store cards. I just got Apple Store gift cards with some Apple purchases -- are you saying that I just need to act disappointed enough to get it? That I need to be as demanding and foot stomping of a customer, then it makes sense?
There is a point where the customer is wrong. I'll take the downvotes, but Apple says no to countless people every year who make irrational demands. They still manage to exist.