Incovenience

So last year I bought tickets for 2 events on Computicket. I paid online with my banking details and collected the tickets later on. Fine I attended those events in 2015. FIVE MONTHS LATER, on 19 February my bank account gets deducted with the two amounts from 2015! Apparently the bank paid Computicket in 2015, but did not recoup it from my account. What bothers me is that the bank Did not inform me in 2015 already that the tickets weren't paid! Month after month , NOTHING. I even bought tickets for another even during December and the money was collected successfully. Now I'm in a situation where in Feb 2016, my back is negative and I cannot afford to pay my bills with the money been taken ONLY now! I mean , who's fault is it? Why didn't the bank contact me already in 2015? Why must I be inconvenienced So Much for the BANK's MISTAKE???? R1600 is No Child's play!