Abhibus Services India — related to cashback issue

I have booked bus on AbhiBus From Delhi to Varanasi on 03/10/2019 for travelling date on 25/10/2019 with ticket number[protected] . At that time here cashback Offer, of 50% upto 600 ₹ for first ever transaction through Paypal account, was given .When I have booked they did not given cashback . On asking for cashback from Abhi bus they told me that Paypal will give you cashback but paypal were saying that you were not eligible for cashback because of payment done through virtual debit card. But this terms and condition of transaction with virtual debit card was not given on AbhiBus account for cashback eligibility. But this terms and condition should be given. So I want the cashback for this transaction.