Duplicate and ********** transactions

I have been querying many duplicate and invalid transaction going through my bank account. At this point at least half of any transaction I make is duplicated. The ***** investigators say it is valid because it happens on the same day and time and place I was shopping at?! There was a duplicate on my daily cash limit withdrawal and my balance decreased twice, again I was told this is valid because I did do the first transaction and it was at the same date and time. Perhaps they do not know what duplicate means? There is also a ATM withdrawal for R907.00 - this too is apparently valid? Not sure when the coin slot was installed at the ATMs? There are 6 months of 'funny' wrong, invalid transactions, increasing in volume and value which apparently does not require investigation. I just put petrol in my car in Cape Town and then drive back to Joburg to make purchases on the same day! They are also unable to provide unique transaction ids per financial transaction?