Unauthorised Deductions and no recourse

I need some assistance.

Not sure if the business name chosen is correct but Tracker the company that installs devices in your vehicle for tracker.

I settled my account with them and have the paid-up confirmation letter. Yet they still deduct money from my account without my authorisation.

Mail to them falls on blind eyes.

what can we as people do?

Please help.

Account details

Settlement of Account CLI***