Bad service - no service at all

I booked a groupon voucher with Rolling stones Driving School but they refuse to honour the voucher. They are actually using the Groupon site for exposure but do not want to honour the deals. They have been giving me the run around for 2 weeks. Did not even pitch up for the lessons they promised to come for. Nobody should use this driving school. Groupon should put it on their site as a very bad and ************* supplier rather than advertise for them