Whatever you do, please dont do what our neighbor did, and just put a bag of cat poo on their doorstep.
My partner went to speak to the women & she went off on one at him! Yes, we have 6 cats and a cat, but we also have 3 litter trays and only 2 of our cats go out at a time during the day when we are at work.
The women ranted n raved about a grey cat, only for my partner to stop her and make her aware of the fact we dont have a grey cat! She just assumed it was ours because we live 2 doors down.
We have said to her, if she makes a list of cats she sees going in her garden, and if any of the cats are ours, we will take full responsibilty and pay for & do whatever it takes to try & prevent it.
This happened a couple of months ago, & strangely, we havent heard any more from her!!