Go kart only worked for a day

I recently purchased a brand new go kart on the 9th of April 2015 and received it on the 11th of April 2015 from the go kart company. On the 11th of April 2015 I called Eugene Swart to tell him the go starts then switches off. He told me that maybe the go kart is not getting enough fuel. The go kart was then parked until we could get a mechanic to check it. The mechanic reported that the clutch is burnt. I called Eugene on the 18th of April 2015 to ask him why this could happen. He told me he would send me a new clutch. But on the 20th of April 2015 Eugene sends me a text message to say I need to pay for the clutch. So I called Eugene to say I want to return the go kart , Eugene then cuts the call and now refuses to answer his phone.