The process does not work that way. This thread has more information.
Essentially, if you preorder a game on the $10 list, you put some value of at least $5 to hold the game. Your receipt will indicate an estimated due value of the full amount of the game (no discount). You do not receive anything else at this time unless explicitly stated (like posters during promotional events).
When the game comes out, you return to the store with your receipt. Assuming competence, you will be asked to pay the $47.99 (assuming $59.99 MSRP) plus whatever tax is appropriate minus your original deposit. Your deposit is considered a form of payment at this time, not a reduction of the cost. The game is now yours to do with as you wish.
At some point typically within the next fifteen days, you will then receive points on your My Best Buy account equivalent to the $10 promotional value. Depending on your account level and settings, you will either automatically generate a certificate or add the points to your bank. You may then spend this $10 however you wish on any other item Best Buy sells.
This gets slightly more complicated if there is a coupon involved or you redeem a different certificate, but typically they are applied to the full price, then your discount applied.
It sounds like you paid the full amount during preorder, from the way you described the transaction. So you should not be asked for further payment (again, depending on how tax figures in), but neither will you receive a refund.
