Why are there double transactions???

After being notified of and reporting some transactions that I did not make, I decided to take a look at my bank statement for the last 2 months. There have been numerous times in which amounts were deducted twice. I called the helpline to enquire as to where the transactions took place and was told that the location was not showing on the system and i would have to go down to a branch and fill out dispute forms but they will not be able to do anything about it.<br> <br> I have done this before but never seem to have anything resolved. I am continuously disappointed with the service i have received from Nedbank both at the branches and call centre. There are numerous transactions in which I have been charged for 'PURCH/CASH' and subsequent 'ATM CASH' withdrawels for approximately the same amounts which I have not withdrawn and have not received notifications for the subsequent withdrawels. SMS notifications that I do receive are often delayed, some for as long as 4 days. Furthermore, I find it unacceptable that the location of these can apparently not be picked up on the system. Nedbank is a large and supposedly reputable bank and should be able to provide me with this sort of information