Voucher code supp**** is invalid

Bought a \Own a Piece of Lunar Land with Moon Register"deal on 4 December and when redeeming it on the website received an error citing the code was invalid. Filed an email complaint to GROUPON and was told and agent would be calling within 24 hours. its passed that now and the agent hasnt called. And the deal on GROUPON now has \""Not Yet Available\"" yet i already bought and paid for it."""