Swan Energy review: They offered me to invest in gas/oil drilling

Two weeks ago I received the phone call from Swan Energy, and their agent asked me different questions and said that they had the opportunity for me. The agent offered me to invest in oil/ gas drilling. I wasn’t interested in such things, because I had my business and didn’t have time for some other stuff. The agent said ok and hung up. However, 3 days ago I got another phone call and this time the agent offered me new deal and he promised good profit. I don’t know how to get rid of these guys.