Are fraudulently attempting to debit money from my checking account for a dental financing account paid in full and closed in 2006.

They state that they sent a notice advising that failure to provide proof that the account was paid in full would constitute acknowledgement and acceptance of a balance they state is still due and payable.

They've now sent a "notice" that since they received no proof that the account was paid in full, that they will now begin debiting the checking account on file for the full amout due.