No help from NBA

I , Narainsamy Pillay had taken a loan with direct axis, because of my financial situation and non payments to direct axis, my account was handed over to NBA .I made a payment on 26.10.22 but the ref no was wrong .it was my mistake and I'm trying to correct it .I call my bank to reverse the money but I have to pay for the reversal. So I emailed nimble group more than 3 times asking them to correct my payment .I sent them proof of payment and the correct ref.no but I still get calls saying my last payment was made in October and not June. I am tired of this calls and I stopped the payment and I will not pay till they call me and say me that the payment is sorted Thankz