I too know of at least one individual who has had a 5TH attempt under the national exams (and failed).
Some people under JAR have lost every credit because they failed by 1 or 2% in ONE exam, despite the mess of the system - no backing bending from the authority even for them, which is more unfair than in your case.
Unless you can prove your exam was unfair in any way, why should you get more time and a further attempt? You knew the deadlines, you knew what had to be done, and for whatever reason, you failed (regretful but true).
AND;
Yes, JAR people had UPTO a 10% mark up - but it went faster than it appeared (lasted less than a year). And it did not make passing any easier. I would have preferred it if they had resolved the REAL issue rather than all that symptom coping (free re-takes, 10% mark ups, attempts dont count till passed at least 1 exam, etc).