Services denied although under guarantee.

Last week I called barons to ask if my car is still under guarantee, because I noticed a day prior that my hooter is not working. I was informed by the lady, I cannot remember her name that yes indeed it is still under guarantee which will come to an end by April. I asked the lady if i can book in my car to have it fixed, she then informed me that she will pass on my details to the lady who deals with bookings. I waited for two days to be contacted after I made a 2nd attempt to call Barons again. Eventually the lady calls me back and we made arrangements to have it booked in on Friday the 16th she asked my car details ect. On Friday I took in my car to have my hooter fixed. Two hours later I received a call from Yusuf informing me that my hooter cannot be fixed due to my car that is due for a service( in two weeks according my my calculations) . I informed Yusuf that I did not get an pop up message indication and normally a message will pop and Barons normally does a courtesy call as a reminder. I informed Yusuf with all that information and plus I did not budget for my car to be serviced at that moment on that day. I was denied to have my hooter fixed because I did not agree to have my car serviced although I informed Yusuf of my financial situation. I am extremely disappointed with their service. I was denied to have my hooter fixed, even thou it is still under guarantee.