I have over $300 in my account (I only use them for Best Buy certs and $50 starbucks cards) and realized I haven't received a survey in over a month and thought maybe the invites were going into spam so logged into the website to find out my account is inactive and it gave me a link to email them and I haven't heard back.

How long should it take me to hear back? And why would my account be deactivated with that much in E-rewards currency when it's only been a month since I've done a survey? I'm going to be really pissed if I spent all the time doing surveys to lose the rewards (and I gave them some pretty detailed info on a couple surveys).