Broken goods

I have had a really bad experience with cash crusaders roodepoort princess crossing ,a few months ago I bought a laptop from them and it broke within a month ,I wasn't allowed to get a refund and was forced to exchange for their products ,one of which was an amber microwave which has worked twice and never again ,why are they selling broken goods and why are they so expensive??????they should be forced to close down their franchise as they are selling broken goods