Byju's — Byju's not returning my money

Byjus sales team contact me to buy their education course for 5th-6th, they asked me to pay inr 5000 as down payment and i did it (Upi) through the link they provided. Though, i asked them to cancel my order post knowing byjus feedback. But now they are forcing me to pay full amount first to refund the down payment which is very annoying. When i contact byjus support team on 17th sep and dropped a mail too regarding the same they told me i will get my refund and will get the call back from byjus cancelation team in 15 minutes but i didn’t get any single call till date, i’m continuously following up with company for last 10 days and drop number of mails to byjus. But they are not processing my return request.