My Money

I would like to dispute a transaction that went off my account without me authorizing it. When i swiped I was told that they were offline and the transaction did not go through. Then my husband then paid cash for the item. When I told them that it had went through I was told it was going to automatically reverse back into my account. I went back today and told them that my money was still not back, they advised that on their side it didnt go through and I should take it up with my bank. Now I am left pleading with my bank who is supposed to protect my money asking them to assist me in this matter. An amount of R3999.99 is alot of money. Nedbank needs to take accountability for their customers and now take charge. All I ask for is my money and for Nedbank to assist me in getting my money back thats all.