terrible customer service

i am suppose to take in my car for repairs tomorrow, and Avis is suppose to provide that service, they did call me yesterday to finalize my details however i couldn't answer the phone as I was driving. I then called the number receive on my voice mail which is *** and I spoke to one of the most terrible consultant I've experienced in my life. Her name is Penny, she just left me hanging and not letting me know what's she's doing on the system and she was so unprofessional i felt like i had called a ****a shop and then she told me that, she's trying to assist me and I give her attitude and that if if i'm not satisfied with her service I should call the call center tomorrow and then she just left me on the line hanging. I am so disappointed as i thought Avis is a model company which strives for excellent customer service.