I have a Razer Thrasher 7.1 Headset - Where to get Razer Surround Pro Activation Code?

Hello Razer Support...!

I have a Razer Thrasher 7.1 Headset, I also had registered it to razer surround but when I clicked on registration then it says that only you can buy activation code in two ways

1. First is for registering your razer product
Or
2. Buy Razer Surround Pro Activation code.

My Question is that, I have a valid registered razer product, So
Where to get Razer Surround Pro Activation Code?
Or I have to pay again for the activation code?