bad service

On the 5th july 2015 I received an sms that my Toyota Yaris(CM53GDGP) was due for service, I contacted West Rand Toyota confirm if my car was still under the service warranty for 75000 km. Bianca answered my call and confirmed that my car was under extended service warranty. I then booked the for the 7th july 2015. My boyfriend took my car in and Erika took in the car. Later during the day Erika called me and told me Bianca made a mistake my car is not under the warranty. I then told her not to service the car and she told me that the service was done already and I must collect the car with R2500 or I wont get my car. On the 8th July 2015 I went to the branch and Bianca told me that she has discounted the service fee from R2500 to R1400 then she will release the car or she will keep the car until I can pay. I asked to see the service manager(Marko), he released the car and told me to pay at the end of the month.