Dont take your car there for service their service is poor

I bought a vehicle there and got a problem with it. I took it to them for service and they told me the timing chain must be changed.i agreed with them to change it and they did their job and got payed.The very same timing chain broke after a month and they promised to fix it for free.its been 5months now waiting for them to fix the vehicle but now the owner comes back to me saying that is not his problem because their job was done 100% and even if can take to court they dont care