I've bought plants from Andreas for the past seven years, and I've bought a lot of them.
Personally, I've never had any problems, with the exception of a recent shipment which
didn't make it through customs in San Francisco for some reason, and that was presumably
beyond his control. In fact, to make it up to his customers, he's promised to send a free
plant to each person who was inconvenienced by this debacle.
In addition, I've met him personally, and can tell you that he's a very nice person, and knows
what he's doing. However, he is pretty busy, and it can take him a while to get back to you.
It's also possible that he has simply forgotten to reply to you. In any case, I doubt that
it's intentional, and suggest that you send him another message.
Hope that this information helps you, and that it all works out OK!