The CBI on Friday questioned industrialist Anil Ambani for over six hours in connection with a Rs 2,929-crore cheating case, registered against Reliance Communications Ltd and him on a complaint by the State Bank of India, officials said. The CBI on Friday questioned industrialist Anil Ambani for over six hours in connection with a Rs 2,929-crore cheating case, registered against Reliance Communications Ltd and him on a complaint by the State Bank of India, officials said.