If the cats are inside/outside the neighbours can't control the direction of roaming

But there are things you can do...

Jif lemon (lemon juice) can be sprayed around the pond or orange rind. Cats hate citrus smell.

You can buy jelly crystals to spread over your garden under different brand names in UK one is called 'Get Off'

Or subsonic noise maker are expensive but very effective.

Or movement sensitive water hose or spinkler can also discourage cats.

Or lastly get a cat themselves will clear their garden of other cats !!!!