sks associates northern leasing unauthorized electronic withdrawal from business checking account new york, New York

sks associates of new york city took  88.56 out of my business checking account without authorization. i had a lease with them over three years ago for credit card processing equipment. at the time they were named northern leasing. they were such an awful company to work with i ended my business with them the day my contract was up. now, three years later they come back saying i owe taxes and other fees. its dirtbags like these guys that are bringing down america. what can be done to stop this thievery.