Having to put one star as zero wasn't an option—a complete Con. AVOID! SAVE YOUR MONEY AND BOOK DIRECT. I saved two vouchers brought as gifts to contribute to the "new" activity, Shark dive. When I looked into upgrading, the value I had to top up was incorrect and overpriced; going direct with Bear Grylls is cheaper. I contacted Red Letter via the horrendously long-waiting live chat system (as there is no way of physically speaking to anyone). In which the advisor seemed to be talking to multiple people (assumed from the delay in responses) and repeatedly asked for my voucher ref to check if the voucher had been activated when I stated I didn't have it with me but wanted to know why I was being overcharged he just assured me that if I activated it the problem would rectify itself, or he would refund it. (Luckily, I downloaded the chat) Fast forward a few days, I activated the vouchers, paid the additional £180, and generated a code, to then the code be "invalid". After another lengthy exchange via live chat, to be told the booking system is down (for that activity) and has been down for a while (if ever actually working). But because I activated the vouchers, they are not eligible for a refund. I raised a complaint with a response saying I could only have a refund on the £180, not the other (£160), as it was outside the 30 days, yet that's not what the other agent had said or was prepared to do before I activated the voucher. So I was advised to active, knowing full well that would void the refund. There is no time on the system being back on line; even if I accept the refund, I now can't afford to go direct as the remaining money is tied up within a system that I cant book. Even though technically, the vouchers are now intertwined with the most recent purchase and within 30 days. Responses from the company are vague, and non-acceptance of being able to purchase an activity knowing I would not be able to book. I await the "we are sorry but keeping your money" response.