Yatra.com - refusing to offer promised discount and services

I booked Yatra Europe Supersaver package id- YH******* / YH******* for * adults and * child on **th March ****.
Following are my concerns:
*. No one reverts over mail and calls unless we chase them by continuously calling and mailing.
*. Promised *-star hotels and offered a *-star hotel in Paris where we've to stay a maximum of * days. This was confirmed for the visa application. Later on, raising an issue now they're saying you won't get it but also not sharing the details of hotels for all locations. They say it is the policy to share it *-* days before departure.
*. Total cost- INR *, **, *** per person for adult and INR *, **, *** for the child out of which we paid Rs. ******/- as booking amount (*.* lac) and visa fee (*****). The day before visa appointment we're asked to pay visa fees at VFS on the promise that they'll refund the amount paid which is not done yet.
*. The offer of a discount through HDFC payment was offered which meant Rs. **** instant discount and Rs. ***** as cask back within ** days of payment. Their agent guided me at the time of booking to avail this offer on the second instalment. But now they're refusing on the pretext of bank offer is no more applicable. I could have paid this amount before but they guided to pay on the second instalment. Now they're offering only a **k discount and asking me to bear the rest of *k.