Incompetent Mechanic

My car had a worn timing chain and busted piston ring and was in need of a full engine overhaul to change rings and bearings as well as a full service, Not having the time to do the job myself I contacted the above mentioned company on referral . The owner and hes brother came to assess the car and said that the timing tensioner is damaged and would charge me R 6 500 to do the complete job incl. service, rings ect. I agreed and sent the car off . 1 week in he phones and requested another R 1000 for the engineer to check the valves. I told him i wasn't happy because he already gave me a price, but i needed the car for university and had to pay him the money. 2 weeks later he requested i buy a 5l bottle of oil, which i did. When he started the car the ticking/slapping noise was still there and when i asked him about it, he said the car had to 'settle in'. 2 months later the noise was still there and when i asked him about it he said that i need a new timing chain, I told him that i paid him to sort out the problem but it it is still not sorted. I refused to argue and left. Please make sure that you guys get documents and sign an agreement with your mechanic.