Byju's — Refund and cancellation of the products

I purchased one byjus product for my daughter in the month of may 2020 with loan. I then purchased 2 more products for my relatives from my bank account but as soon as it reached us we decided to not keep them. I called the sales person who gave me the product he told us that emi wont get deducted and we can keep the tablets. We trusted him and couldn't notice that emi was still getting deducted from my salary account. After 4-5 months when I noticed around Rs 80, 000 was deducted. I asked for their help but they refused to help me. I am still willing to give their product back and want my money. They are not ready to help.