Thank you for voicing your concern. Given that it’s a private transportation there is no way that it should have been cheaper.
It isn’t also stated that the entry fee is not included before booking.
You also advise the falls was so small it could be walked in 10 mins, but that’s was all on you. You were advise to get a tour guide who would have taken you on a full tour of the falls and surrounding area but you also choose not to, so why are you here with all the negativity.