I ask what the basic issue is, then call the general bank number (or a number to their department, which I validate online before calling it). That way I’m initiating the call to a trusted number, and they can go through their process to authenticate me. Every time I’ve done this the person calling has understood and seemed to appreciate the caution.
You could ask them to list your last 3 transactions, and their exact amounts. Easy to cross-reference by looking at your banking website / app.
I've never heard of this, I'm very curious.
It isn't. China is the best example that draconian identity verification / KYC processes don't stop scammers.
Since WeChat allows accounts created outside of China, it's these accounts that are used. And it's why there are times it's a pain to create a WeChat account outside of China.
The financial transactions all take place outside of WeChat.
Although, I haven’t had many instances of communications from my bank where I cared about them authenticating. Like, if they tell me there is a problem, I can go check it out through the app, website, or whatever the user-initiated channel is. When I feel like it.