I bought Nero 10 Platinum HD a few months ago. I've upgraded my computer a few times and had to format the hard drive. Just re-installed Nero again and apparently i can't use it

I emailed Nero 4 days ago along with a Paypal receipt for their product but they haven't been back in touch.
Is there a way to de-activate this patent activation so i can actually use the product?
This sucks that i have a geniune copy that i can't use.

.