The second complaint i am putting in please help

Hi i am here to complain MFC connected me trying to fix this mess i was in. I was sent to Action gearbox to fix my car. The car went to them they claim they fixed my car but my car keep on going back to this action gearbox i told my insurance that i do not want to take my car back to this people and i was told there is a 12 month policy in place. The car was collected on the 9th September 2020 action gearbox had my car for a week which was told i would get on car back on the 16th never got my back never got any communication from the dealership my car was brought back this evening only to find out the car is doing the very same thing leaking oil and the very same fault codes that was on the car when it left is still there i am very disappointed in the serviced i got. All that i want is my car to fixed the car is a new car now my car must back and fourth its not fair