A 64-year-old retired bank employee from Dahisar was allegedly duped of Rs 1.57 crore in an online investment scam, police said Thursday adding that they have lodged an FIR in the matter. According to the complaint by the retired bank employee, she was added to a WhatsApp group called "Goldman Sachs Investment Management” and convinced to invest in share trading and IPOs through a fake app. The scammers, posing as investment experts, promised unusually high returns and gained her trust by showing fake profits in her account. They forced her to invest more money and eventually stopped responding when she tried to withdraw her funds. When the 64-year-old woman realised that she was duped, she reported the fraud to the cyber helpline and filed a complaint with the Cyber Police Station following which an FIR was registered. The cyber police is investigating the matter.