Driving instructor answering phone calls during lessons

I enrolled at delano driving school in california. The fee was 240 dollars, for 6 hour lesson. My problem is that everytime she comes and picks me up for my driving lesson, she's mostly late. And I barely got the hours back from her for teaching me to drive. And while I am driving, her phone is always ringing, and she's always taking a call, so I didn't know whether to turn or not, because I am waiting for her instructions for where to go. Mostly her calls take about 20 minutes or more. And I know I paid cash for her time to teach me how to drive, so it's not right that she'll be taking calls on the time I paid for, she should just let her calls go to voicemail. And she told me I was ready to take my driving test, but I failed miserably. I knew I still needed to work on my parking and backing up, but she said I was fine. I addressed those issues with her, that I needed to work on my parking and backing up. I could have rescheduled my appointment at the dmv, but it's too late I failed. It's not cheap paying $240.