Thanks for your reply.
Have you any idea how much they put a hold on your card for ??
We've already paid our car and all inclusive insurance direct with Dollar, it was all booked and paid months ago - they've now told us that they're going to hold the cost of the car hire again plus 15%. So they're gonna hold nearly $700 on our credit card....(plus we've already paid it in full).....
Was just wondering if you'd come across anything like this.