HDFC ATM
Transaction Declined but Amount Deducted from Account

I am a Union Bank of India A/c holder. I was tried twice to withdraw Rs.1000 from the HDFC ATM Centre in New BEL Road Bangalore, But in both the machines it said transaction declined and it failed to provide the receipt also. Then I tried in a near by Indian Bank ATM. It was successful and I withdrawn Rs.1000. When I check my account balance in Indian bank ATM I am shocked to know that Rs.1000 was missing from my a/c. I checked in UBI's internet banking and it also shows that I have withdrawn Rs.1000 yesterday. But I withdrawn only Rs.1000 successfully.

I had sent a mail to Union Bank Regarding this.

What should I do?

Will I get my money bank?

Should I have to contact HDFC A/C also or UBI only will do for me?

Thanks