Byju's — Harassment for payment after course discontinued

We joined 2 years live classes course in Byju's at the end of September 2021 and will ending may2023. I discontinued 31st June and mailed 1st july 2022. After my request session link not given. EMI 80% paid. After discontinued they balance 20%payment and refused for refund. Yesterday byjus staff called and asked order copy for refund policy. We sent to him. It is clearly given for refund eligible when discontinued the course any time. Refund given based on session attended. Instead of refund they harnessing to do balance payment. I need Justice for it