I have taken a loan of rupees 7500 in July 2019 and repaid rupees 8132

I have taken a loan of rupees 7500 in July 2019 and repaid rupees 8132 on 31st July 2019 using payment mode available on Loan front which is Google Pay. Transaction gets successful but after that Loan Front Team is calling me and sending messages daily that they have not receive the payment . I checked with Google pay and they also said payment has been made and amount has debited from my account but there is issue with Google pay due to which Loan front didnt receive the payment . As Fault is of Google Pay as Amount was not even refunded back to me .Loan Front Team is threatening me in calls or messages for taking Legal Action against me . I have shared them Google Pay receipt , My Bank statement , Mail from Google Pay that my query is with Specialist team but Loan Front id denying the validity of documents and I dont know on which grounds . I dont want any Legal actions against me but i don't know what to do.