Please share your experience what one can do. My case involves the expedia.de deal from FT. The site accepted 70€ coupon when it should not have. Emailed confirmation showing the discount but actually charged a higher amount albeit not full rate. ie some random 20€ discount appears unexplained. What should one do when contacting expedia and they don't respond for a week? Dispute the charge before the trip? At this point I will be happy to cancel it altogether. Please advise.