I presume you're not witholding your number??
With a new meet, I always try calling them first. If they answer we can both sound each other out and a few well-chosen comments can prove I am a genuine punter. If they don't answer I immediately send a text, explaining I tried calling and enquiring about availability. The missed call followed by a text again shows serious intent. To be fair to them, most WG's I talk to tell me they get dozens of texts each day from time wasters, schoolboys, wankers etc. so they will often err on the side of caution.