SKS associates / Northern Leasing CHARGED bank account for back taxes that they claimed we owed. New York, New York

Our business had a lease with Northern leasing and a monthly fee was deducted out of our account for 4  years.  Our lease ended in OCT of 2008.  Our balance was 0.00.  NOW 2 1/2 years later they auto debit from my bank account almost 70.00 for what they claim are back taxes that we owed from an audit that was recently done.  I called them and the 1st call I was told that the amount would be refunded back.  NOTHING. Second call was made....they told me to contact N leasing by email.  I sent a letter. NOTHING. 3rd phone call went over this and over this...they told me they would send me a copy of my lease.  I asked for a supervisor....no one is ever available. I got a copy of my lease agreement, and all of that is within the realm of my lease period which ended 2 1/2 years ago.  I called them back - asked for a supervisor, NOT AVAILABLE. Finally they put someone by the name of Sean Anderson on the line....seriously doubt he was a supervisor...he hung up on me when I told him I would get a lawyer involved.  I called back...and the last person I spoke to today still insisted that THEY HAVE the RIGHT to charge me for taxes.  They admitted to an oversight on their company's side - but are still saying we owe! WHATEVER...someone needs to do something about this company.