Confed Auto Repair

On 5 / Dec/ 2022, the Heating system of my pick up truck was not working well. So, I gave it to the Confed auto repair, they asked for 150 Canadian $ to repair the heating system but when I went to take my truck on 7/ Dec., after they called me to pick it up, they charged me 330 $ , when I found that the heating system was still not functioning. Now, I don't understand the increased amount being charged. I will ask all the vehicle owners to be cautious of such misinformed act.