Byju's — Regarding product returned partial amount refunded

Address:

NEC Building , BSNL , Ring Road , SURAT

R/Sir,
Byju's Company offered me on a Zoom Meeting demo version of their
product for class 6 & 7 online on 27th May 2023, according to them product will offered you for demo period and their representative confirmed within a month if your child satisfied otherwise whole amount of your booking will be refunded, As per their meeting, i booked product on same date and product will be received 31 May 2023 and online class was stared on 02/06/23, but it was not up to mark, and No confirmation followup by taken them, and I tried multiple time for returned this product online call and whats-app message to their representative (Aman Sarin) but he was not responding than after i mailed to their representative on 10/07/23, and now they refunded only partial amount,
The Product Amount : 60, 000/- Sixty Thousand which paid by Credit card
Refund Amount : 39034/- Thirty Nine Thousand thirty Four Only and
replied that you have take package of Std.5 compulsory..
Kindly Do needful to refund my whole amount .