Byju's — plus one plus two study kit

I have applied for the study kit by remitting rs.3000/-. Since the product was not worthy I decided to return and applied for refund.I submitted the cancellation request on the 17th day of purchase because the other two days were leave, the cancellation team are not willing to accept my request beacause of the lapse of that two days.I am the only earning member since my husband passed away 5 years back. My son is studying in 12th class and this product is really a loss.We bought it only as a sample and the person who introduced the product said it is very easy to cancel and refund.It was not at all beneficial for him for the kvpy exam.I am really tensed because the remaining amount will be deducted from my account as emi.urgently resolve my issue