Received a text message from the Postal Savings Bank saying that online merchant loans overdue.

You should contact the Postal Savings Bank immediately to inquire about the specific situation and take measures to solve the overdue problem as soon as possible. First of all, you should contact the Postal Savings Bank to find out the reasons for the overdue period and whether the Postal Savings Bank will provide help. Secondly, you should repay overdue loans as soon as possible to avoid more late fees and other expenses. Finally, you should check the loan account regularly to ensure that the overdue situation will not happen again.