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Pest control - unwanted cats on property

We have two unwanted cats hanging around our property. One entered last night via the cat door. Our cat is becoming very anxious. Have phoned SPCA but they will only look at them if captured and brought in. Need assistance catching these cats. They are also doing mating calls at night and generally being a nuisance, no matter how many times chased away. Neighbours don't know who they belong to.