UPSET CLIENT

i would like to share my discontent with the service i received from car from service city horizon view on the west rand, i was dealing with a gentleman called Jaco. I aske him to do the major service on my BMW 320 d 2013 model. I also asked him to replace my breaks. I paid for a major service however about a week later I was experiencing problems with my Coolant in the radiator it was leaking. so I took my car there yesterday 12/04/2022 and he then wants me to pay R3900 for the leak telling me that this is not part of the major service, i asked him why was this not part of the service which i had done 3 weeks ago. i am highly upset because im not stuck without a vehicle which i paid a huge service for.