Unlink the credit card and debit card:
1. Open the China Merchants Bank APP.
2. Enter the APP and click "My" in the lower right corner.
3. Verify the account and log in.
4. After logging in successfully, click "My Credit Card" on the page.
5. Enter the My Credit Card page and click on the icon on the page (as shown in the picture).
6. In Settings Management, click Repayment Management.
7. Click "Automatic Repayment Settings" to enter the next page.
8. Click "Cancel automatic repayment" on the page to unbind the bank card and credit card.