Reported poor conditions and lack of common courtesy, go hand in hand.
You have to ask yourself this. If they treat you in such a manner when they need pilots, how the hell are they going to treat you, when they are not??
All it takes is just to click on reply, then send. At least that is better than nothing.
If they cant be arsed to respond from advert responses, it speaks volumes. Oh I'm told it is the way of the world these days. I say BS!!!!