We taking flight from Taipei to Singapore IT511 on 2 Dec 16.While checking our baggage and the counter informed me I has only 30kg but I total purchased 60kg.He informed that due to the 30kg under my dad name so it is not valid.WTF!!! We already purchased return ticket for my dad but due to his health condition unable to a board with us and we can only suck thumb for this. Now 30kg cannot be used due to my dad not boarding really cannot be accepted . I told to the counter staff but he insisted the exceed of 9kg need to purchase 15kg with NT1500. Money is one thing but the staff act really cruel. My family and I sincerely felt that we will not take Tiger air with this type of treatment.