Bad service ever

I took my car in for service and break pads change on the 15th August in Kempton Park warehouse, same day when I fetched my car I noticed there was air coming out of the engine when the mechanic was excellerating, I asked him is my car doing that coz that never happened before he said it’s normal for ford to do that. Took the car home same day and when I got home, few minutes later I noticed there’s a water leak on the pavement, I took the car back to workshop and as I was driving and changing gears the car kept jerking. When I got there I told them to check it out and I was told that they are unable to remove one of the spark plugs as it is too tight and can’t be remove and they dnt want to break it as it will damage engine. They checked why the car was leaking and was told the clamp was loose and need to be replaced, and they did that. Till to date my car is giving me problems and keeps jerking and misfiring. Today 28 Aug, my car is overheating and not driving like before. I am so frustrated with Wozani Rosebank Auto as they damaged my car, it was fine before I took my car to them. They don’t know what they are doing and I regret taking my car to there. Now I have to spent more money fix my car.