massage envy is audio taping legal allen, Texas

I am concerned about the possibility of being audio taped at work. There a no sins sating audio taping is in progress and the law seems a little grey unto this area. I feel that thus is a rip-off because as an employee you may expect to be video taped but what you say in confidence to another should have reasonable privacy. I could've been talking a
with another about a medical problem and yet I know they listen because very private conversations have been thrown back in my face and I was told others had informed on me. Thus has never happened before and I don't know the legality of this action. Please help. Otherwise this company rips its employees off for information so they can keep the slaves unto line.