Byju's — Not receive refund after cancelation request

Address: India

I had miss guided by byjus salesman last year in december in midnight around 10pm and get a signature from me saying its will not apply for loan just for your proof . but after my child was unable to understand online classes.
I requested byjus to cancell my class .
They never cancell and refund my Debit card emi its is active now but no classes provided after 1 month last year .
once byjus team called my and refund me ten thousand rupees.

I have to paid them total 65000 .
Please help