Thiss idiot wont stop calling me what can i tell him?? any advice please.?

So my ex calls me occasionally to make small talk about eachothers lives but im starting to hate it -_- what can i say to him next time he calls, to make him feel like the lowest piece of **** on the planet, and to make it known that im jus fine without him and that i REALLY dont like talking to him anymore, without making it seem like im just cutting him off cuz im either jealous or frustrated? much thanks.