After the phone sank me once, and the water to the usb-c mobile phone can not be charged either by cable or wirelessly. how can you help me?

thank you very much

It append to me sometimes. Shutdown, dry all the water and restart the phone to solve this issue.

sams wrote:

It append to me sometimes. Shutdown, dry all the water and restart the phone to solve this issue.

+1.
Be sure to COMPLETELY dry the USB port before charging!

I tried with hair dryer.. nothing change, no charge

If you tried to charge it while it was wet, you may have fried the charging board.
The only thing you can do, at the moment, is to contact your seller to have your phone replaced under warranty.... hoping he will honor warranty terms...

I buy it from Aliexpress "Blackview official store" but they tell me:
"we are so sorry that you didn't buy the warranty service".

I don't know where can I send it to repair.

Can you please post a link of such store?

BLACKVIEW Official Store
https://s.click.aliexpress.com/e/cCD0Q6Od

You can contact our local agents:
http://www.blackview.hk/global-agents/

Or you can directly open a dispute on the AliExpress platform. They will manage everything.

I'm sorry but i can't help you further with that as the seller is the only one who directly manages warranty terms. We can directly manage phones bought from the online store in our website (not AliExpress).