First of all, did you pay the bill on May 1 day? If it is a holiday, it will be postponed to May 4th. It takes 1-2 days for inter-bank remittance to online banking. If the account number you provided does not match the user name, the money will be automatically returned to your card (ICBC). But to get the money back, you need to hang it in the internal account of ICBC, and the staff can only enter your ICBC card after handling it. Actually, it's no use calling customer service. ICBC is very rubbish. I suggest you go to the outlet to check the transaction details.