Firstsource Advantage Removed money from private checking account without our knowledge or consent causing INF charges to account Buffalo New York

Firstsource Advantage run what looks like a check with all of our banking information through our checking account and removed $168.00 without our consent or knowledge causing us inf charges to our account. I cannot understand how they can what I consider steal money from our checking account without our consent. I have never heard of a company being able remove money from private accounts without consent and want to know if this is illegal with all of the privacy laws we have now and what can we legally to stop them from stealing money from us again.

Ginger
Keithville, Louisiana
U.S.A.