How to receive unpaid benefits after a relative's death

The article states that family members of a deceased beneficiary can apply to the Pension Fund to receive accrued but unpaid utility benefits. However, it's not entirely clear: if some time has passed since the death of the relative for whom these benefits were arranged, are there any time limits for submitting an application to receive these funds? And what exactly is considered the end of the budget period – is it the end of the year or could it be a different date? I don't want to lose this opportunity due to some formalities.