National Highways Authority Of India [NHAI] — Only cash accepted for recharging local card

At Bollapalli toll plaza Andhra Pradesh, they are accepting only cash payment for recharging local card. While the government is encouraging digital payments for everything, then why is it still mandatory to collect the local card recharges charges only by cash? I request you to take the action against the owner’s of the toll plaza and ask them to allow digital payments.
Thank you.