Ford Motor Company AI/ML Data Scientist interview questions

HR screen was simple asking me to walk through my resume. The coding challenge was difficult but, not too much. Ford does not allow any coding language besides Python. However, the grading of the coding challenge is a problem area. I answered all 3 questions and provided the data plots and accuracy metrics in the code. But to my dismay, I discovered later that they graded me a 7% score. This was beyond belief. The recruiter refused to even cross-check if there was any s/w glitch or, human error in the exchange of files or, if there could be any problem with the HackerRank s/w itself. I was declared to be a duffer and written off. I would never interview with Ford again.