I am sorry to hear about your decision and that you had bad experience with support.
This problem you are describing - it sounds like its due to corrupted cookies and we can definitely help you figure it out. Feel free to call us at 1-877-270-4268 or email at support@wildapricot.com so that we can connect and help you resolve it.
Generally speaking these steps should help:
1) Open your website via its Wild Apricot URL without www. For example ABC.camp7.org
Log out if it shows you logged in
2) Now do the same with www, e.g. www.ABC.camp7.org
Again, log out
3) Do the same for your custom domain if you use it.
4)Clear browser cache
Now go to your WA site using its primary domain - make sure you enter website address only and NOT a direct link to any page.
You should have no problem logging in.
Dmitry Buterin, Chief Apricot