Rude and aggressive

5th April 2016 I booked a 30000km service for my Opel Adam. I called on the 6th April 2016 to ensure that the booking has been made and that its in order for the Thursday the 7th April 2016 as I needed to put a days leave in. I was told we cannot find you on the system as your car was not booked in. Again I had to give all the details to ensure that it will be done. I took my car in at 7:40am on the 7th April 2016 for the 30000km service. I called at 11:45am to confirm if everything is going according to plan. I was told that can I bring the car back again tomorrow the 8th April or Saturday the 9th April as they do not have an air filter in stock.....I asked how this could be possible as surely you ensure you have stock available for services. I then asked the service adviser to ask the service manager - Jethro Price to contact me. I left 4 msgs and 6 calls later in a space of 3 hours with no return call or acknowledgement. I called back for a 7th time and I was told by Jethro that he was too busy with too many cars going thru the service station for him to find the time to call me back....I was just one unhappy customer between all the happy ones. He got aggressive and personal.