Irctc — refund not received for cancelled ticket pnr no [protected]

I booked my ticket with pnr number [protected] on 10 march 2019.
I cancelled this ticket on 5 april 2019.
I have already mailed and called irctc complaint centre several times. But no satisfactory response from irctc and haven't received my refund.
Everytime i mail irctc, i get an automated response.
When i call, they put my call on hold to transfer to senior executive, everytime they give me different reasons. I have also sent them my bank statement several times as asked by them.