Got sold an aircon with the wrong compressor

Had the very unpleasant experience of dealing with Hennie Traut of Westair air conditioning. I bought a 9000btu unit from him second hand and the outdoor unit contained a 12000btu compressor. Which is obviously not safe or right. I told him about it and he refuses to come and replace the unit. After a phone call he also treated me and sends me rude messages threatening me. Definitely stay away from this business. He has no integrity.