Bad Experience

I took my vehicle in for check up on the 12/03/2018, assisted by Leslie Green. I received a call on the 14/03/2018 from her telling me to come and fetch the car because it was fixed and I paid R4239.80 for the service rendered. I noticed that the hooter is not working on the 15/03/2018 in the evening and called the dealer on the 16/03/2018, and I was told to bring in the car on the 19/03/2018 for check up. To my surprised I was told to pay R1300, I asked Leslie for what? And she told me for labour and I told how, because according to me that was a return job and I was not even informed about paying the labour. I am very perturbed about the servise I received, how can I take my car in working condition thereafter the hooter is not working and upon all the inconvenience I had must pay extra R1300. I was told because of the time my car spent there, they charge R1000 per hour. So please this is parthetic service with Mercedes in Claremont.