It's always best to check reviews BEFORE ordering!
https://uk.trustpilot.com/review/gogroopie.com
GoGroopie appears to be a pathetic attempt to emulate what Groupon does reasonably well but its 'London only' approach shows that it's still very small (as, indeed, does the fact that it has used the 'total exemption - small' means of filing its accounts with Companies House, showing that it's turnover is less than £6.5m). It's possibly run by just one guy working from home!
However these phone numbers
might help you:
http://contactnumbers.guru/gogroopie/