Customer Service at its Worst!!!

I had a personal loan with standard bank and i was given a settlement amount by one of the consultants; i paid over the amount and i called in for a settlement letter i was then told to go to the branch and get one there. a few months later i received a letter from the bank stating that my account has been handed over to their legal department. when i call their legal department i was told that there R4.23 outstanding on my account and someone decided to hand me over and they have then since been adding the monthly service fees and at the time My account was standing at R360. I went to the standard bank branch in Woodmead where i was assisted by one of the consultant who said to pay the balance that was outstanding which was R4.23 and that he will send a mail to the centurion branch where i had taken the load from to reverse the additional charges. I e-mailed the guy and he said he is still waiting for feedback from the branch which was on the 1st of March 2016. on Friday 22nd of April i receive a call from debt collection agency saying i have an outstanding balance of R560 on my loan account. Standard Bank does not respect their customers and their customer service is the worst i've experienced and its not only regarding the situation with my loan account, i used to bank with them and i have actually moved my account to another bank. I really don't know what to do now...please help!!!