Hi John – This isn't a scam, I promise, and it's unclear to me how you got this impression. I'm the founder of VoiceMap, the app, and Tripadvisor is just one of our sales channels. You need to pay for tours in the app, just like you do here, and buying through Tripadvisor and the app is much the same. (Admittedly there are some extra steps if you buy tours through Tripadvisor.)
The voucher codes you received after your purchase can still be used, if you haven't redeemed them already, so your purchase is still valid.
You can reach me at
[email protected] if you have any questions.