WRONGLY DEBIT CUSTOMER BANK ACCOUNTS

We had an incident where our bank account of our company was debited on the 31st of March 2016. After several calls and investigating, I finally got to the owner of Direct Tell. He said that his client was Mokete and we are surely not him. This client gave apparently the wrong bank account number. After a call to our bank today, that Mokete with acc nr *** DOES NOT EVEN EXIST!<br> How does companies like The Fulcrum Group and Collect Serve get the authority to debit a clients bank account without confirmation of banking details?????<br> This is *****!!!!!!