SERVICE WENT BAD

On 11/3/2016 I took my car in for the 60,000.00 service. On 22/03/2016 I took the car back as the oil was leaking and the air pipe was damaged. When I took my Clio IV in the oil was not leaking and the air pipe was not damaged. I collected the car on 23/03/2016 and I was told that there was a spilage and everything is fine. To my suprise the oil is still leaking and I was promised that I will be contacted on 29th regarding the air pipe. I am still waiting. I was told hat a warantee claim will be submitted and I will be kept updated. No one has contacted me. I was told that the air pipe was actually a weak part in the Clio, if that is the case why am I still waiting for this to be replaced. I do not know what to do as the oil is still leaking and I leave messages to be contacted and no one is coming back to me. I am so frustrated as my car did not have any issues before I took it for service. I wish I knew that taking my car in will cause so many problems. I am desperate for help as I am worried that serious damages will be caused to my car.