Was the objection against the insurer's 2010 refusal timely?
No. The decision was deemed notified at the latest on 2010-12-01, and the objection filed on 2011-10-03 was late.
The insurer could not prove the exact notification date, but there was no allegation of non-notification or refusal of receipt, so proper delivery was presumed. The insured had to expect a decision after requesting reimbursement, sending bills and completing a questionnaire. Applying the deemed-receipt rules and holiday extensions, the objection deadline expired long before 2011-10-03.