School Counselor needs parent meeting, I will spoof call the teacher, Please...

[Click Guy]

...help me with this? First of all this question is not troll or anything like that, I really need help. I am a high school senior and the school counselor sent a letter to my home (My parents didn’t see the letter and I have it now) because she needs parent meeting because I got a D in one of my classes last semester. I really don’t care about this class I got a D in because it was some silly elective class. Now, I obviously don’t need my mom to know or go to that meeting because she panics about everything and I just need to cover up this meeting thing with no problems besides my mom will be working at the time of that meeting. I talked to the counselor and she said I need to let my mom phone call her if my mom is busy and will not come to the meeting. She never called or seen my mom before and doesn’t know her voice. So I decided to use Spoofcard.com to spoof the phone number and change it my mom’s phone number and use a woman's voice( as if it is my mom) to tell the counselor that my mom is busy and will not come. Any ideas? Thanks