These people Owe me a Refund! This is the Fifth time they have called me!

This Group tried to give $1,000, they only Owe me $400! They told me that this was the minimum they could Transfer, according to the Law. They made the Transfer to my Bank Account, yes I accepted the Transfer, they then told I hand to Return the $600 extra the sent by going to a Wall Mart or a Rite Aid and by iTune Gift Cards of $100 or less each! They kept me on the Phone for nearly  1 1/2 Hours, until I finally got Frustrated and Un-Plugged  my Computer, and quit taking their phone calls! Some how the Cancelled the Refund I was to Receive, and have kept trying to call me with a Block Phone Number! I have viewed the Many-Many Complaints against the Scammer, and have accepted I am Out just $400, hopefully this is all I am out!