Byju's — Money not getting refunded- UPSC tablet course

I applied for refund 3 months back within 2 days of receiving the tablet course. I have been calling them day in, day out during these 3 months but of no avail. Every time I call them, they say 'will call you within 4 hrs'. But most of the time, I don't get a callback and when I do, they repeat the same thing ' we are working on your request'. I am mentally drained out and feeling exhausted chasing them for my money. The course was worth 90k and it is creating a big hole in the pocket unnecessarily. Please, I request you to take note of my pleading and refund my money back. You can keep both 28k that you have deducted as EMI till now and your tablet and course books, just cancel my subscription which will at least stop further EMI deduction. Please help.