Wait so you've seen them before and they're ghosting you? Like the other dude above said perhaps you did something you're not supposed to, I don't know.
Honestly, I'm not sure why you're still contacting someone (and that includes non-hobbying) for an entire week when they're not responding to your message. I would just take the hint, stop contacting them and move on. If you keep contacting it will make the situation worse. Just my opinion.