Regarding the coupon, Priya did ask Ram why he used it. So looks like she has not accepted the coupon for coming back alive for Ram
He thought that Priya was just upset about that night, she will be OK the next day. And he has left the phone for her to use, a way of communicating with her family
Ram still doesn't understand Priya. His view about Priya is that she is kadoos. He thinks that she is with him, after all, that transpired, he feels that she will forgive him eventually
Hope these answer your questions