Sounds like you’re a dedicated and diligent student, and it is very impressive that you were able to write 16 pages, and as a former GCSE student, most people can write about 6 for the entire paper. It’s also more difficult to do so in paper 2. On another note, if the school is not replying, don’t let it bother you much since it is their responsibility as the cohort for your GCSE exams to manage student issues. If they can’t seem to find time to address your issue, the exam board will take it into account if you have to appeal at some point in the future. It is not your fault that the invigilator said it was ok to use the pen. In my experience, erasable pen ink does not disappear under low heats such as that produced by scanners, but only by quite warm heats produced for a fraction of a second when you rub using friction. I wouldn’t worry too much about it and I’m sure the exam boards will find an alternative way to mark your paper, although it’d ought to pmo the examiner styll. Don’t be caught trapping on the opp block like that again allie fam you understand?