Comment on Lambert Academic Publishing: A Must to Avoid by Kata

Hi,
I was recently approached by LAP and sent them my MA thesis for review. They answered today that they would be happy to publish it but luckily I came across this webpage. I wrote to them that the deal is off and asked them to delete all my data from their records as they had promised in a previous e-mail. So I didn’t sign anything yet. You don’t suppose they will publish it anyway since they have the pdf version, do you? Or should I be worried?
Thank you in advance.