My delays in repairing my car

My car has been with JL Panel beaters for the whole month now they keep on postponing the day of collection, i am sick and tired of not having a car. today is 12 May 2015, My car has been with them since 12 April 2015 this is not on i need my car back i am stuck now. They told me that by Wednesday this week my car will be ready for collection but when i called them today they are telling me about Friday of which they are not sure about it. All in all want my car back now i cannot tolerate this anymore it stresses me. On Friday i want to go there and collect my car that's all.