PVR Cinemas — cancelled my booking, and now i can't even apply my coupon code

Address:

Nagpur, Maharashtra

I've booked movie at pvr in 2 days advance, and afterward pvr cancel my booking saying it happen due to some technical issues. I've applied 1 time coupon code worth 300 which i had purchased from another vendor, and now pvr are giving me only 100rs coupon against the cancellation, which by the way was your fault.
Either you reimburse me my 300rs voucher or, get me my booking for the show at pvr.
Confirmation no. 6376383
Booking id. Wf6b69k