norton internet security activation problem

Hi, im having a problem with my purchase, i'd bought a 2 years subription for internet security apparently there was a problem during the activation, and I never received the confirmation mail (even though the product was successfully activated at that time) now i had to reinstall my pc and when i went to recover the activation key I found out about this problem,the purchase is registered in my account but it says that i need to confirm it, the problem is that i need the product key to do so and I don't have it.

What can I do?

 

Thanks, and sorry for my english.