The abductors Zamfara twin sisters have threatened to kill one of the girls if payment of their ransom is not made on time.
The twins, Hassana and Hussaina, were kidnapped last month in Dauran town while distributing the invitation cards of their wedding.
A family member, Ibrahim Abubakar, who spoke with the kidnappers and the twins on phone said the kidnappers had reduced the ransom to N15million.
“We are only able to get N6m selling our properties and receiving contributions from family members, politicians, traders and ordinary people,” Mr Abdubakar told DAILY NIGERIAN on Thursday night.
In a viral audio clip, one of the twin sisters, Hussaina was heard sobbing, complaining about maltreatment and appealing for help.
“I am battling with headache. We are in dire situation, they are about to kill us,” Hussaina sobbed.
“They beat us every morning. Please help rescue us. Even yesterday, they slaughtered some people in our presence.
“We are starving. Please get contributions even from the general public.”