The warning, issued by Queensland Fair Trading Minister Merri Rose, comes after complaints were received from around Australia about the activities of the National Computer Training Academy and Australian Computer Training Services, both of which are operated by Wayne Steven Lewis.
Lewis is alleged to have ripped off thousands of dollars from people who bought a book titled Grandparents Guide to Understanding Computers.
Consumers who bought the book, which was advertised the on radio for $33.45 and in various publications for $38.50, complained their credit cards had been debited multiple times for amounts up to $385 at a time.
Ms Rose told Queensland Parliament Lewis was a 'shameless liar and conman without a conscience.'
-Shortly after the amount of $33.45 or $38.50 is debited to the consumer's card, another debit for $385 occurs.
-It is obvious Lewis is targeting the elderly community," she told parliament.
She said that when the Office of Fair Trading originally approached him on behalf of four consumers who had dealt with Australian Computer Training Services, he blamed a systems error for the unauthorised transactions.
However, since then the office had received a large number of complaints about National Computer Training Academy doing the same thing.
-Some consumers reported up to five unauthorised transactions of $385, totalling almost $2000.
-Police say up to 180 unauthorised transactions have been conducted on credit cards throughout Australia."
However, Ms Rose said Lewis was continuing to write to people who had had unauthorised transactions on his credit cards.
-In his letter he is apologetic and blames 'a genuine error that occurred within our business to a select few clients'.
-Lewis also requested the consumers' bank account details, advising them he would be happy to refund into their bank. But he's after richer spoils," Ms Rose said.
Lewis was convicted of fraud and forgery last month after obtaining credit cards in a friend's name and Queensland Police now want to question him over the computer guide rip off.
