Bought RazerBlackshark V2 pro and lost activation code. Need a new one before i return this headset. i have proof of purchase

I need a new activation code from razer for my Blackshark v2 pro headset. i keep getting this horrible buzzing sound then tried to fix it and found out about 7.1 surround and how it doesnt already come with the headset, gotta do all these extra steps and by now the activation card is missing. PLEASE get me a new one or take this thing back!