Tricky?!

Ok - what's the scoop on Tricky? Got the call today about the cancellation.

We were looking forward to seeing him. The last time we heard only one or two songs - and then noticed that my wife's (who's Swedish) son (who was visiting from Sweden and legal to drink there) had been kicked out for drinking a beer that my wife had bought for him. (We were newly married and it was her first time at the 9:30) And so we left - and had waited until now to see Tricky again.
Looks like the kid really fucked things up for you.
Tricky has cancelled. The show is going on with Cut Chemist as the headliner.

If you already purchased tickets you have the choice of either getting a full refund or attending the Cut Chemist show and getting a $5 refund. Tickets for Cut Chemist are available for $20.
Could someone please post instructions for how to get the Tricky refund? I got my tickets via mail from the Tickets.com site – So could I mail them for a refund, or do I bring them in person to the 9:30 club box office, or what? Thanks very much.