AVAST PREMIUM SECURITY ACTIVATION CODE

I am trying to activate my Avast Premium Security and it is not accepting the activation code from that after sales invoice. Cant get a support as it asks for a 6-digit pin I have no idea what. Any help?

Contact Sales: https://support.avast.com/en-us/contact/sales/
If you don’t have an order # use 00000000 then explain your problem.