Return my Deposit

Last year, my family and I moved home from Johannesburg to Cape Town and i notified Eskom to cancel our account on the 7th Jan 2015. After supplying all the required documentation and our banking details we were told that it would take 6-8 weeks for our deposit to be paid back. It is now Jan 2016 and still no money has been paid...We have rang Eskom Account Manager (Central) - Mongesi Daba, over 15 times and each time we are told that \i don't understand why it hasn't been paid"and that \""someone will call to update us later today\"". We are so tired of being passed around"