I bought the linerider 2 unbound:

after I install in my pc they ask for a dac activation key naumber. when i put that number in they the nember I put in is invalid and they told me to contact the customer services but don't know how because the don't have the contact number or email for me to contact so what I should do because I just bought this game and how can that number been use so if any one could help me with this I am very appreciate it very much thank you.