Zaakpay.com — waitlisted ticket cancelled amount not yet received in bank

My waitlisted ticket booked on 27-april-2018 at irctc connect app through zaakpay portal was cancelled by me on same day i. E. 27-apr-2018. As per irctc connect app amount of rs 3340 has been refunded on 28-apr-2018 by reference no. Zp[ hidden] but till date it has not been credited to my account. Neither bank nor irctc are giving any reply as the amount is with zaakpay. Please help me in getting my money back.