Disappointing Service at Audi Polokwane

I have booked my car for a service and battery replacement at Audi Polokwane on 14/12/2021 where I begged for my car to be booked sooner but I was given the date of 24/12/2021 only today to be called that my date is actually today...despite me being 200km away to Audi Polokwane I drove to Audi Polokwane just for battery replacement as I suggested that if they find it they cannot finish everything today, they can only do battery replacement and I can book it again for service. Upon my arrival I was told that just for battery replacement the car can only be out after Christmas. Battery Issue - the car in question is a Audi S3 2020 model bought in late last year as a brand new car...and I don't even play music while the car is off. I DONT UNDERSTAND HOW THE BATTERY IS DEAD SO QUICKLY???!!!

I've been driving Audi since 2013 and this is my 3rd Audi and I've never received this terrible service.