Inexcusable company makes customers pay for their own mistakes!

During July I called fnb to be aware, people are using my ID number to open *****ulent accounts, and what happens some stupid person at fnb goes and puts a hold on my cheque account! It costs a lot now for me to fix this as I'm abroad and so when I asked them to reimburse me for the money I spent trying to get hold of them internationally because of THEIR mistake, they refuse. Should this matter not be resolved I will close my accounts when I get back to South Africa!