We booked a flight with British Airlines from Prague to Bangalore which was coming via London. We called British Airlines customer service hand in advance to check if a transit visa is required. But they informed it is not required as it’s only a 2& 1/2hr layover. But we were not allowed to board the flight in Prague by Airport Authority due to no transit visa. If it is a standard process to have transit visa for all Indian passport holders flying via London ( like we were told by the airport service provider in Prague) why was this not mentioned to us by the customs service operator of British Airlines. Customer service has totally miss leaded us. We mention the entire scenario & requested for information on requirement for transit visa. They clearly mentioned not required as it’s only a 2 and half hour layover & language will be taken care of. Also mentioned it’s the same terminal. This is a very unprofessional behaviour. It’s a clear fault of the customer service department of British Airways. Travel agents are not responsible as I received incorrect information from British airlines customer service. We requested for a full flight fare refund but have not received anything back. we had to face lots of inconvenience to fly back to India. We spent a full day on road as no flights were available. British airlines have behaved very poorly with us.