Citibank — ATM Gave me wrong amount

I hold a Citibank Suvidha Account, and happened to use the State Bank of Travancore ATM located in Kumarakom-Kottayam main road on the 15th of March around 1230PM. I requested the ATM to give me 5000 Rs. instead of which it only gave me 4000 Rs. I came back today to Bangalore and decided to pursue the matter through the forum. Kindly help me in this regards.

Ac. No- [protected]
Card no. [protected]
Phone [protected]

Regards,
Mayank