Nedbank refuses to pay back money ******!

I have been a loyal customer with Nedbank for 40 years. On the 11th of July 2014 money was transferred from my cheque and credit card accounts *******ly. I contacted Nedbank the very same day, I was told it was an inside job as the money was transferred into 2 fictitious Nedbank accounts. The money ****** from my cheque account was paid back 4 days later, unfortunatly Nedbank has refused to pay back the money ****** from my credit card account! I have exausted all avenues trying to get this money back and have been told it is somehow my fault the money was ******! I am now receiving accounts from Nedbank every month for this money along with extra bank charges! I am a pensioner and am very disappointed with Nedbank. Please help!