Ijivitari MP David Arore, who was negotiating on behalf of the relatives told Loop PNG this morning that the seven days ultimatum will lapse this Friday.
The relatives presented the compensation demand to the company on Saturday.
They are demanding K50 million from the company.
Meanwhile, Arore said the mass burial will be held tomorrow.
The road accident happened last Monday which claimed 13 lives.
The incident involved a PMV loaded with passengers and an Oil Palm truck.