They are breaking the law by taking away your lunch time!! Tell them that! And tell anyone else who will listen. Calling you in on your lunch time is considered "part of working hour time" - legally they can not do that! Not here in ILLINOIS anyway. I'm sure it holds true for all states!

Please keep up posted on how this all turns out. I'm sorry for all that they are putting you through. I worked at place like tht once.