IIBF — not permitting to write exam

As i came to exam hall in time but due to mis communication reached hall at 11:10 to attend for 11:15 exam but i was not permitted to write the exam. Even the iibf helpline numbers are not lifting the phones. We cannot find any help from either iibf or exam centre authorities. If any person doesnot attend the exam why donot iibf return the fees or reshedule the exam.