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