According to the information I found online, the credit card service hotline of Taiyuan China Merchants Bank Credit Card Center is: 400-820-5555. If you want to check the progress of credit card processing like the landlord, there are several ways besides telephone inquiry:

1. Landlord, you can go to the credit card website of China Merchants Bank, and then click "Application Progress Query" in the right center of the website. Enter the credit card application progress query page of China Merchants Bank. After opening the page, select the certificate type and enter the certificate number to query the current application progress.

2. Add the official account of China Merchants Bank WeChat, then enter the main interface of China Merchants Bank Credit Card, click "I", and then select "Card Delivery Progress". Next, enter your ID number when you apply for a card, fill in the verification code, and then click "Query".

If the landlord is still worried, you can call the customer service of the bank where you handle the card and ask about the relevant situation. You can also go to my love card website to see if anyone else has answered the same question as you. I hope my answer can help the landlord!