Would I be wrong to loop in the principal to ask my that my son be allowed to retake this test

My son is in the 9th grade and has both dyslexia and dyscalculia along with autism. He has an IEP. My son had to take a test in science and how it was formatted confused him. The test packet has 2 parts. Both going from 1-25. The answer sheet however went 1-50. So when he got on part 2, question 1 the answer sheet said 26. He failed the test. Not because he got the questions wrong but because he accidentally skipped a line on the answer sheet so all his answers were off by one line. When I spoke to his teacher she said she figured that's what happened and could tell he did that. I asked if he could retake the test to correct it and she said no. I asked why and she said his IEP allows him extra time on test, a private room to test, etc and that allowing him to correct a mistake isn't in the IEP. She hates IEPs anyway and she's not doing anything she's not legally forced to do. I told her that I used to teach and I get how stressful IEPs can be but he clearly knew the answers. He just filled them out incorrectly. He's not even completely retaking the test. Just correcting his answer sheet. I explain how numbers confuse him and she said and I quote "The world doesn't care about Matthew's Disabilities." I used to be a teacher. I support teachers but I feel like she's being unreasonable. I thought about looping in the principal because the F doesn't reflect his knowledge. Even the teacher said when you move his answers up a line most of them are correct. So she knows that test doesn't reflect his knowledge. I think he should be allowed to correct it.

@Ashley yes the teacher herself said she could tell that he made that mistake because she herself said when you move his answers up a line on part 2 most of them are correct. He accidentally skipped question 30 and then all his answers were thrown off