Whether the opposition against the decision on default interest was filed within the 30-day statutory deadline.
The opposition was filed too late because the decision was deemed received by 31 January 2012 at the latest, so the 30-day period expired before 20 September 2012.
Because the decision was sent by ordinary mail and the insured acknowledged only learning of the amounts by late January 2012, receipt had to be placed no later than 31 January 2012; the opposition therefore fell outside the non-extendable statutory period.