Byju's — Refund of money

Date 8 july, 18
Byju's employee id tnl 2oo7o7549
Came to talk to us for my child's learning program from jaipur office. We agreed over simple conversation. He took a cheque, and other bank details and accepting over monthly emi.
After a couple of days i received call from their head-office about surplus amount to be paid, after a short conversation, immediately i told them to stop the program. But when i went to bank 5000 /rs where deducted from my account. I struggled a lot to get back my money, they returned some money but still. I want my money back.
After such a long period, they have not returned my hard earn money. Please help me.