Products and services is correct. For example, you could purchase the Alterac Brew Pup ($10) but you could not purchase the Celestial Steed mount ($25). It is ultimately up to you, the customer, to know the availability and price of the product you want to buy and plan your Blizzard Balance purchase/charge-up accordingly.
In this case, you were not aware that the Game Time products available had changed and did not acquire sufficient Blizzard Balance to cover the cost of the currently available products.
While unfortunate and understandably a little frustrating, there’s nothing unethical about this. The change was announced in March and broadly covered by fansites. We made no attempt to hide this information or trick you into buying Blizzard Balance.
We won’t be able to extend to you the product you’re looking for as it is no longer available for purchase.
Regardless of what decision you come to about where you find your entertainment, I wish you all the best.