If you read TFA it explains that they did consult their lawyer before and after, but that fighting them on it would cost more time and money than they could afford.
"...yes, we do have a lawyer and we are currently following the advice of our lawyer in everything we are doing. We can challenge the contract but legal fees could run over $30,000 and take years."
Which kind of sounds like they might have hired a lawyer after the fact in an attempt to 'fix' the situation.