When to give up? Keep getting blown off

I rarely get the opportunity to sneak away to have fun.

The last two times I have tried to lock-down time in advance with two different ladies on P411, both well-regarded and reviewed on this board:

Lady 1: I'm sitting in a gas station waiting for her to give me the exact address. Sat there for 20 minutes. Give up to drive home. Almost home, I get a text saying "oh I just now saw this".

Lady 2 (today): Lady agrees to date\time\place and will confirm morning of. Morning comes and goes, I send one PM asking if we need to reschedule. I can see she read my PM but still doesn't respond and just tells me yes/no. Log into Eccie and see that just a few hours earlier she put up ad. I mean, wtf?

I understand stuff happens but what am I doing wrong? Do I just need to start using texting to communicate rather than email/PMs?

Guys that do this on a more regular basis than you or I will probably have a different routine, but I will generally make the initial contacts a few days ahead by email/PM, but then morning-of, will use text to confirm, then phone/text at the door (if needed). Upon leaving, I will try to send a quick thank-you text, or if it's an hour or so past the time we visited, I'll send a PM/email to thank.

So, yeah, just before the meeting is set for, I want the most direct means of communication. At that point, my time is just as valuable (if not more) as theirs....