HYDERABAD: BJP State president Bandaru Dattatreya on Monday described the attempts by Congress members to obstruct Leader of Opposition L.K. Advani’s speech in the Lok Sabha as ‘betrayal of the Telangana cause’. In a statement he said the ‘true colours’ of the Congress were exposed during the discussion on Telangana. He wanted people to teach a ‘fitting lesson’ to the Congress. -Special Correspondent