Fatti - Firstly, all the responses were likely from men. So that should explain that

As for Jet, they lack in common sense more than anything - an all areas, every day. Unfortunately, they're not entirely at fault (from a legal perspective) by not considering your pregnancy or realising you might want to travel with your companion. Also, don't hold your breath on their replying, or the reply making sense if indeed there is a reply.

since they put you on an alternative and got you to their destination, you will likely not have recourse to EU compensation, either unfortunately.

Besides the overbookig mess, if you found Jet to be acceptable, then I'd say fly them again. It's very unlikely you will encounter the same problem again.