Fishing email

On the morning of the 29 july 2015 i went to work, as usual i check all my mails. I came across a mail which was about u count points, so i opened the mail which had a attachement to it. When i opened the mail it took me straight into my internet log in for standard bank. This was about 06h30 in the morning.I put in my details, then it asked for my one time password whick took a few minutes to come when it came it was the wrong number. Then i realised there was something wrong so i closed the mail. After a few minutes i received a message on my phone that R4000.00 was transfered from account. I was shocked as to how this happened. So i waited for the bank to open to report this, this was done about 09h00 when i reported this incident.I was refered to the ***** division of standard bank, they asked me questions on what happened. I was given a Case No. 2015.7.5990. On friday the 14/08/15 at 16h12 i received a message from Standard bank stating that the case is complete. So i phoned them to enquire what was the outcome ,them a lady told me that standard bank is not taking responsibility for this incident. Please can u help me cos this is a lot of money to me and its set me back a lot.