Ugh, yeah. Ran into that same scenario while working with my third ever consulting client. The features we wanted were advertised as built in, with no (obvious) mention of it being a kind of "in app purchase".

I felt like a total asshole telling this client we needed to shell out another few hundred bones. Then the thing ran like shit (need a lot of rebooting) and we replaced it after 9 months.

Haven't looked at their garbage since.