Absolutely ATROCIOUS customer support. There's no phone number or email address to contact them on, just a chat which is always busy but even worse they never discuss any options or try to fix the issue! The first time you go to the chat to ask for help you're not far from the top of the queue and get responded within 5 minutes. You then tell them the issue about the booking and they ask for 3-5 minutes to look into it. When you check back in the chat they provide an answer that doesn't resolve the issue and close the chat without providing any opportunity to discuss further. Then when you try to chat again you don't get a queue number at all, you get a message "You're in the queue, but it's a long queue. Please wait while we connect you." We've wasted a few hundred dollars on a booking for Korea that has problems with it caused by Klook's issues with Lotte World. Klook doesn't want to resolve the issue at all! Beware of this company because if there's any issues they will not provide any way to resolve it!