Florida car hire went in to insolvency. I have a copy of the paperwork here. Global leisure cars also were involved. Both companies were owned by Holiday Cars LTD. Apparently someone has bought the trading name GLC and FCH. They will not honour and vouchers but will sell you more of the same. Tracking things deep down trading addresses are the same and it seems to be a bit of a side step.
I would avoid floridacarhire completely. Not worth the hassel.