Problem with activation

I have got 09.11.12 years on a site from USA Steinberg Cubase 6 Full
Retail Box Version with FREE 6.5 Upgrade w USB KEY NEW. In connection with that on
That moment I had no worthy computer for the given product
Opening of a box and installation Cubase 6 it has been made in it to year. The product was established
Without problems, and here with activation there were difficulties.
It has appeared, that my code already has been used. As it has occured-
Not clearly, in fact opening of a box has been made only in it to year. Having addressed
On a site where I have got the given goods, with the claim I have received the answer, that all terms
On acceptance of claims send. I ask you to prompt, that to me to do in this
Situations. Yours faithfully, Vladimir.