Guild Wars 2

how to get in contact when tickets are not being responded to ?

There is no way. All you would have received is generic responses anyway.

No response as in nothing? Not even a automated confirmation that your ticket was received?
Then take a look at this thread.
Otherwise if your ticket is older then 3 days you can post the ticket number here.

just received the generic response to say they have received the ticket.
we sent 2, one from my email to get my password reset and one from another email to get the other password reset.

mine came through after 20 minutes.
the other one seems to be stuck somewhere.

and we cannot remember the serial code to the game.

just an update
all sorted now, they got back to us for the other account