Kolkata: Police arrested a middle-aged man from Kanksa in West Burdwan on charges of duping his colleagues by using their credit or debit cards without their knowledge.For the past few months, officials of a private healthcare unit noticed that money was getting deducted from their bank accounts. But initially it did not draw attention as they failed to realise it immediately after the money got deducted from their bank accounts. During investigation, police have found out that the arrested persons had opted a unique modus operandi while using debit cards of his colleagues for shopping and even didn’t get caught. He used to wait for the times when his colleagues left their wallets or mobile phones on the desk. Taking the opportunity of the situation, he used to take out the debit card from the wallet and keep away the mobile phone so that they do not get to see balance alert messages. He used to buy goods using the debit card and the mobile phone was needed to enter the one time password (OTP). He also used to delete the messages from the mobile phones. Later, he used to keep the mobile phones at such a place in the office itself that its actual owner used to think that he had kept there by mistake and used to carry on with his work without suspecting anyone. Police initiated a probe after two three employees found that their money got deducted from their bank accounts.While investigating into the cases, police have suspected that someone from the same workplace was behind the incidents and finally the middl-eaged man was arrested.