Last week, i went to Singapore one day and used my U mobile postpaid international roaming for GPS usage and messaging app(They actually have a 50MB free of roaming data). However, after i came back to Msia, my phone service got barred, and i received a bill of payment RM634 need to pay for the exceeding roaming data. I called to the customer service tell them it supposed to have a credit limit of RM150, but they told me i was at the different country using different operator. So, my question is can i ignore this bill ? Because i am going to start working in Singapore next week, and i'm no longer need this postpaid line anymore. I heard they would blacklisted me for applying the umobile service only.