Immigration to mainland banks in Hong Kong.

If you come to Hong Kong with a one-way permit, but the one-way permit is missing. Can't reissue it!

One-way pass is very important! Sometimes you will ask for a one-way permit when you go back to the mainland to apply for documents! Only in this way can you prove that you immigrated to Hong Kong from the mainland. So be sure to save it! Everyone in my family saves one-way permits.

I suggest you go to the exit-entry administration office that issued you a one-way pass before going, and ask them if they can give you a certificate or something.

If it doesn't work again, you can take out all the money. Then open a new bank account with a home visit permit.