Hertz - Member Number Expired?

I tried to log onto the Hertz site yesterday and my member number is not valid. I have the card with the number Hertz sent me. I called and really got nowhere so I just reenrolled at their website. Tried emailing them but so far no answer. I have a new number but why would I have to re enroll? Have not used it in a few years but Avis worked fine.
Thanks in advance :)