Access Bank, refund me

On October 28, 2013, I used my Access Bank ATM
verve card on IBTC ATM situated near Mararaba,
New Karu, Nasarawa State. The machine
dispensed N4,000 instead of N20,000 I requested.
I immediately went into the bank to complain and
the officer told me to go to my bank, Access Bank,
which I did fill the necessary form. Efforts made
since then to get my refund of N16,000 have been
fruitless, the officers at my Access branch in
NNPC Towers, Abuja are not helping the situation.
Access Bank plc should please refund my
N16,000. Thanks.
Alonge Olufemi,
Plot 190 Keffi/Abuja Road.
New Karu Nasarawa State.
+2348037816....