unauthorized transaction

This morning I received 2 notifications of transactions processed on my account, I promptly went to my nearest branch as these transactions we're both ********** only to be told that nothing could be done to stop or reverse the transactions as they were still pending Authorisation. I was assisted by a lady in the bank that phoned the ***** department who also said nothing can be done. What sort of assurance is this that anyone can just take my money and the bank's attitude is that they won't do anything to correct it.