Byjus - Regarding cancellation of loan EMI

I have cancelled Byjus subscription on ** March, ****. The team asked me to wait for a month to get EMI cancelled. But in October ₹*** rupees were debited ** times as ACH RTN CHRG i.e, ₹*,***. Then I got to know that loan is still active.
When I contacted salesperson, Dilli Prasad,
(Email: thedilliprasad@gmail.com) (mobile no:+** ***** *****) he asked me to pay ₹*,*** to not have any dues on my account and get NOC. But i didn't receive any NOC till now. Instead I was harrased on calls to pay full EMI.
I even sent many mails to cancellation team but still no proper response.
On *th December I received a call from Rana Pratap, (email: rana.arinapally@byjus.com) (mobile no: +** ***** *****) he said he was from 'cancellation and refund' team. He asked me to pay ₹**** in order to keep the tablet with me and get full refund of around ₹**,*** to "UPI id :byjuspayee**@axl".
Still I didn't get any refund. Later again he asked me to pay ₹**** as bounce charges to get EMI cancelled.
Now he is asking me to pay one month of EMI i.e, ₹**** so that finance team will cancel my loan. He is threatening me if I won't pay money my loan will never get cancelled by finance and I would have to pay total EMI.
It's clearly negligence of Byjus team as cancellation was not done properly and i had to suffer such huge losses. I am just from a poor family and a student. Due to Byjus i had to suffer mental pressure &depression for this whole year. I cancelled on March now it's January ****.
I will take this matter legally and fight till end!!
I request you to immediately cancel my loan, give me my refund and NOC! Please look into this issue and respond immediately.