HDFC Bank Ergo General Insurance — Cancelled my policy but still my money got deducted

Address: 392002

I have cancelled my health suraksha policy my policy number is[protected]. I have cancelled it on 31/3/2017 i have got cancellation msg also but again after cancellation of my policy my money again got deducted on 14/04/2017 amounted 13, 481.
We have complained we got only 5370 instead of 13, 481. I didn't still got my remaining amount. Please kindly refund my remaining amount as soon as possible.