The bank will try to contact the customer through the following channels:

1. Phone call: The bank will try to contact the customer through text messages, phone calls, WeChat, etc. to inform them of the overdue situation and urge them. Customers are required to return overdue amounts as soon as possible.

2. Send a letter: The bank will send an overdue warning letter to the customer's registered address to remind the customer to pay attention to the repayment time and the bank's contact information.

3. Door-to-door visit: If contact cannot be reached by phone or letter, the bank may also send personnel to the customer's address to conduct a door-to-door visit to find the customer and repayment issues.

If the bank is unable to contact the customer, it may take appropriate legal action against the overdue account, such as adding the overdue account to a credit blacklist, reporting it to relevant credit files, using legal means to recover arrears, etc. Therefore, you need to maintain good borrowing habits and make timely repayments to avoid overdue loans.