HDFC Bank — Regarding refund of loan processing fee

I spoke with your office mr. Jayprakash Patra ([protected]@hdfcsales.com) regarding the home loan balance transfer. on 11th Nov 2022 I sent all the required documents on the above mentioned email address and his WhatsApp number (+91-[protected]). after all the documents I paid the loan processing fee of Rs. 3540/- dated 12/11/2022 (Transaction reference no (YIC[protected]), which Mr. Jayprakash Patra assured that the processing fee will be adjusted at the time of loan sanction. On 15th nov 2022 I submitted my adhere consent on [protected]@hdfcsales.com. after some days I received a call from Mr. Jayaprakash part informing me that my rate of interest (ROI) against the home loan balance transfer would be between 10 to 11%. but my existing home loan ROI was below 9.1% in the month of nov so Iinformed to cancel my application and return my processing fee amount. Now it's been almost more than 3 months my processing fee is not yet refunded. and Mr. Jayaprakash is not answering my calls and messages. Please refund my amount of rs. 3540/- at the earliest.