Aakash Institute not refunded my amount

I have paid extra instalment by mistake through online transfer for my Daughter study at Thane Manpada Branch.

I have visited Branch Accountant & Br. Manager so many times for refund extra amount or provide me receipt for that extra amount, but till now they are not responding for that.

payment done on 23rd Aug 2022 but till today Aakash Institute have not refunded my extra amount.

Can any one help me on this.