Bad Correspondence

I have a Private Client Cheque account with FNB. I am currently in China and are use my South African FNB card to withdraw funds at a Chinese bank. On the 7th of August I was through money in China and I was double debited for a single withdrawal amount R439.17, in other words I withdrew money once and the same amount was deducted off of my account twice. I have logged this complaint with the necessary department and also with my private banker. I received a reply from that relevant department that I was supposed to contact stating that there is no such withdrawal on my account that was double debited for. They had in fact not read my email properly and looked for the wrong amount. I contacted my bank are again and told her that the amount was incorrect and I was advised to email the specific department again and wait another 48 hours for them to respond. Yesterday I emailed my banker again after getting an email from her stating that I would have to wait again. I rep**** saying that initially if they read my email correctly and look for the proper amount then I would not have to wait again. I would like this matter resolved as soon as possible as I’m getting no assistance. As I have stated I’m currently in China and I cannot be reached on my South African cell number bit only via mail unless they contact me on my Chinese number +***