This friend of mine works in a engineering company (EC1) and draws 5000 pm. She went to another engineering company (EC2) showed a fake salary slip of 5,500 pm and got an offer for 6000 pm. She showed this offer to EC1 and asked them to match it "or else". Soon she is paid 6,000 pm in EC1. Is this unethical or the standard way of seeking a raise?