Suddenly, a phone call came. It was customer service, and then it hung up for two seconds. What's the matter?

there are various possibilities.

Nowadays, it is very common among scammers to change the number of software and change the phone number at will. So what customer service number you see is probably just a liar, don't take it seriously.

So whatever number you see, as long as it's not someone you know or a customer's phone, just hang up.