[Resolved]  Byju's — installation issue

I bought their sd card for class 12. Since i uploaded it, it has no videos, as it was my only reason to buy it and the salesman pestering me, i asked for refund saying its their fault. But no one is responding. Dont buy byjus products. Its a waste of time and money. My money has gone to dustbin. But calling themselves teachers. Shame. The money i paid may b a number to them. But it ia my familys one weak expenditure. Kindly help.