Yep - after all I went through, I rang them up with one last effort on Friday and thank goodness got through to someone who actually wanted to help me. They changed my status for me right there and then after confirming my former Prop. status.
Good luck, and definitely give them a call on Monday so you're won't be late for the Tuesday sale!
they will also process my $20 refund for me next week, but really, that's secondary to getting in on the pre-sale.
I rang the general #: 1-800-767-7160 and then they put me through to the supervisor on duty who dealt with it for me.
Thanks to everyone for your suggestions - very grateful for your help.