HDFC Bank — money refund

I have a made fund transfer of rs 5000 from mobile to mobile in payzapp app on[protected] the transaction get failed and money didn't credited to my payzapp wallet. I have called on customer support no. [protected] and ask for clarification of refund they could not give a proper information, many a times the is in waiting, and when connected to executive they don't cooperate with me please solve theissue as soon as possible