unauthorised debit order

I am logging this complaint on behalf of my husband. Tracker has been debiting his account for the past 2 months. We have already paid Norton and now debits are going off. Husband called in and was told they will investigate and call him back. The 6 days turnaround time has long passed. He sent a follow up email & the 6 days turnaround time has passed aswel. No-one is coming back to him and now another debit has gone off! His banking account is accumulating bank fees due to these unpaid debit orders! This debit order needs to stop as he is no longer a client with tracker and bank charges would need to be reimbursed!