Vendor not replying to messages?

Double means they've seen the message.

If you asked for information, they may be gathering it for you, so try to give them a little time. If you don't get a response within 3 days, look elsewhere

If it takes a few days for them to respond see if they have a website and contract them through there. I have had a few vendors have trouble with WW messages getting stuck in their junk or spam folder. I luckily had a friend who was a mutual acquaintance to the wedding planner I was trying to hire otherwise I would have moved on to someone else. Once we connected directly through email replays came quickly. I now don't contact vendors through WW as this happened a second time when reaching out to caterers.