Milking the poor during hard times

I took a R2000 temporary loan with them, after that I took a R5000 loan with them according to temporary loan rules anything that goes into your account automatically pays the temporary loan but I just found out that they did not and when I enquire about that they are saying my account was overdrawn by R1300 so they debited that and my question is there was still money so why did they not debit the temporary loan? Now they want me to pay the instalment and the temporary loan and I see that as very unfair and it paints greediness from this bank and I can not wait to leave them. My ID No. is *** and I have persuaded to leave this bank several times but I have a connection with them as I have been using them since the Junior Bob card times in the 90's when I was still a young boy doing high school, but this?