"Too many attempts" ??!!

Hey i am kinda new to World of Warcraft and this is my first topic posted, but I am being faced with a serious problem on upgrading my account. While in the process of upgrading from my trial account to my 60 day membership card account i reached the page where it asks for the "authentication key". when i saw that i assumed it meant the code on my membership card. Unfortunately it didn't, and thanks to my luck lol i realized that right after i ran out of attempts. Now i cant put in the correct code due to "Too many attempts". If anyone has experienced this before and knows how long i should wait or what i should do, please let me know.

P.S- This whole incident happened around 4-5 hours ago... :/ thanks again