How did you pay for your flooring? Credit card I hope. If by CC, dispute the charges. Provide any written communications you've had with lumber liquidators. What do you expect from a company who most of their materials come from China?
Some call that condition bananna boards. It's fairly common with engineered flooring. What's the measurement at the ends? 1/4" 1/2 inch?The boards have been "acclimating" since Friday and we can not see any change. They remain curled at both ends.
Doesn't that tell you people anything?
Ask them one more time to let you return the product for no charge because IT IS DEFECTIVE. If they again refuse, call a lawyer and tell them that's what you are going to do.
Those people are used to complaints and threats so don't piss around with them - CALL A LAWYER.