It all boils down to - Can You Prove It ?
It's pretty unreal just how much people can get away with.
You can fight back though. There are several types of recording and data retrieve devices that can be used.
try checking out:
Do some research on what may work and how to use the devices properly.
I know its a plug but, its a related one that I make a living off of so Im sure the mod's wont mind as it is helpful.
You can always hire a Private Detective to do things the right way. Go to :
The postings are from people just like you, looking for help and solutions for problems that the police wont handle.
There, you can post your request and have PI's in your local area bid on your job for the price YOU SET.