We bought a combination voucher for an Amsterdam entrance to Van Gogh museum and boat ride. The local operator, Stromma, would not honor the voucher.
Because the museum was sold out, which as very disappointing. However, they would not refund the cost and told us to send the voucher back to Viator for refund. After 5 emails with Viator, they notified me they would refund the museum fees and I could have a credit for the unused boat ride for my next trip to Amsterdam, which is unlikely to happen ever.
I tried to post this review on Viator, but they have refused to post it. Viator is a SCAM.
Reason of review: Problem with delivery.
Monetary Loss: $177.
Preferred solution: Full refund.