Horrible service

I'm still without a car after my car gave issues after they did a major service. Two days after my car got serviced. Now Novel Ford is trying to claim from my plans and me. My car was fine and drivable. Suddenly oil pressure errors, car overheating and powerless after they worked on it. When am I getting a straight answer? When am I getting my car? I'm now about to return to work and need my car. You've kept it for December and disconnected my battery a few times but no feedback to me.