How do I delete an unauthorised video, please?

Get back in touch with them and tell them they have 7 days to remove it

or you will take legal action for Copyright Infringement and redistributing

without your specific permission.

However this also depends on where you live and the country where

the site operates from.

Hypothetically if the country is somewhere like Russia or in Africa then

you have no chance because these countries are outside the jurisdiction

of the Copyright Laws.

Also bear in mind, what maybe illegal in one/some country(s) may not

necessarily be illegal in other countries.

If you recorded the Video, then you have rights,

But if you are just in the video, then sorry

Claiming Copyright on a site outside your home nation can be difficult

Appeal to the Operator again, or the Provider