Flexi Rate Up To 20% Off Grand Swiss Belhotel Medan, Indonesia. Special discount for BNI46 Credit Card holders, receive up to 20% off on flexi rate staying at Grand Swiss Belhotel Medan, Indonesia. Terms & Conditions: Period of booking & stay: Now until 20th December 2016. Valid for individual guest & Bank BNI46 Credit Card holders. Guest must show Bank BNI46 Credit Card upon check in for verification and payment purposes.