Economy Bookings (economybooking.com) (bookinggroup.com) review: Last minute extra insurance charge

Car rental was fine, per se. But at the last minute, they tacked on an extra insurance coverage which they claimed I asked for. I DIDN'T! When i was finally able to get in touch with them the next day, they said too late and sent me an explanation that confirmed the extra coverage was an optional extra and why it was so desirable and sorry but they can't offer me a refund. I did finally get a refund from my credit card company who, in turn, charged it back to these scam artists. LUDICROUS!