Angry customers

My car is a second hand car that I’ve had for 7 years now and for 6 years without experiencing any problems with the car. Last year I took the car for service at this place. After the service they told me that the lower arm controls, the water bottle and other things needed to be replaced and they gave me a quotation. I took my car to them to get the parts replaced and ever since than I started experiencing problems with my car. The thermostat is not working and engine water started to over heat and appeared muddy. They now claim that the rubber of the water bottle cap is finished. Last year December 23rd the right lower arm control unhooked and the wheel came out but luckily I was driving at 20km/h and did not get hurt. According to the other mechanic the bolt that’s supposed to keep it together stripped and the rubber is cracked . I had to buy a new lower arm control. The company is refusing to take any accountability for putting on an old bolt on a new lower arm control