I want my full refund for a cash deposit that did not reflect on my account!

On the 25th of October just after 12h00 midday, I made a cash deposit to my account via the ATM. The process took a bit longer and suddenly the machine went on "OUT OF SERVICE" mode, I immediately called the bank explaining what had happened. They told me that it would be resolved in 24hrs. To my surprise 24hrs later, I was refunded half of my money with no explanation. TILL TODAY nothing has been done about that, because I called again to question their decision. I was told it has been handed to the specialist department. There has been no feedback to date. I want my money back!