15 minutes for no answer

I phoned Standard bank to find out the end date on a loan that I have, so I get through to the first department, who can't help, so they transferred me somewhere else, and they did the same. This can't help and transfer kept going for 15 minutes. EVENTUALLY I get through to the people who \can help""; you must go to a branch to find out the end date of a loan cause apparently a BANK CAN'T WORK OUT INTEREST!!!!! How can a bank not work out the end date on a loan they signed. Its pathetic; 15 minutes; of being bounced around to get told;we useless at maths sorry."""