I have used this company on a few occasions, and never had a problem. However the one time I did have a problem, they were so appalling that it is hard to fathom how they can operate this way in the UK.

I did not receive tickets to a gig because I moved address, and although I contacted SeeTickets twice, they did not get in contact or confirm receipt of my new address. I called them multiple times on the day of concert and got cut off twice; told I couldn't take email confirmation to the concert; then told I would be contacted if the tickets could be found (they were at Royal Mail - who tried to deliver to my old address).

No guesses, but I didn't end up making the concert due to Seetickets calling me back too late. When I tried to claim a refund, I was met with silence. I sent a letter and 3 emails. I called their sales line (no number advertised for Cust Services) 3-4 times.