I'm not sure if this will fix it, you can try waiting until the next skip day, which according to the walkthrough..Yeah, so here's what I did. Triggered Kendra scene, went to bed and woke up, talked to Billy about getting a BJ. He comes over, the 3 some happens again, and then I talk to Janice. There is no option to ask about the phone call.
*Next time option to skip school will appear after 7-14 days. It will appear only if Jason sleeps in his bed*