Why can't China Everbright Bank credit card WeChat receive consumer information?

There are the following episodes in which you can't receive text messages in several cases.

First, the system docking problem, the docking between the banking system and the mobile phone card operator system is occasionally omitted, resulting in the failure of information transmission;

Second, the credit card bank didn't give you a short message reminder of small consumption. At present, at least one-third of banks do not provide free SMS notification for consumption below 500 yuan, which must be paid by consumers, and 500 yuan and above are free;

Third, the mobile phone used does not match the mobile phone number reserved when applying for a credit card at that time.