******* withdrawals

This is a company that sends a sms to advise that a debit order is being loaded against your account...always the amount of under R100.00. There is a contact number ********** when you phone it you are notified it does not exist or ***rings and when you push 1 for accounts it disconnects...the email address ********** - it does not work. i have given no authorisation or signed documents for this Debit Order. Does Nedbank not require signed documents for the debit order to go off? Who is the Assist Lifestyle and where do they get details to hack onto an account and load a debit order.