Ugh. I’m so sorry to hear that. You’re not the only freelancer to have gotten lured into one of those sites. My rule of thumb, even as a newbie, was never to accept less than $10 for every 100 words, unless it was a fantastic gig that would get me good exposure. Even if you don’t have a portfolio, you should only take on projects you’ll be proud to show to other people when they ask what you’ve done. It sounds like you are creating good work right now, but unfortunately, it’s for a client who totally doesn’t deserve it.
A word of caution: Remember that where very little is required, very little is offered. These jobs don’t pay much, and they are not going to provide a reference for your resume. It may take working at several different of these online jobs to pull in the income you want. And as always, know the signs of a work-at-home scam as you sort through the opportunities.