Account deduction

last week i realised the is a deduction from Truworths on my bank statement, called Nedbank call centre was told i swiped and i need to raise it with Truworth. I then contacted Truworths and they said to me they know nothing about the transaction. I called Nedbank call centre again and was told to go to the branch and tell them i want to dispute the transaction. went to the branch and got a form for dispute which i sent to the email address on the form and never got a reference NO or a call for this it has been a week now. went back to the branch yesterday after Truworths came back to me and said i last swiped at their shop on the 7th July 2015 so they don't know how money can be going out on my account now. I went back to the branch yesterday and i was told stories which don't make sense to me and that i should call center to dispute transaction. when u swipe money goes off so i don't get why on the 19th money was taken again from my account. this has nothing to do with the transaction appearing on statement at a later stage because money was actually deducted on my account. very disappointed because i got no help from the branch or call center i am just sent back and forth.