PT. GAYSA KARYA PERKASACV. GAYSA KARYA PERDANA info : support@gaysa.co.id e-flexi : evoucher@gaysa.co.idJl. Raya Margorejo 18 B SurabayaTelp : (031) 70982850, 70182850, 8480797Fax : (031) 8414688