Call centre-bad service

I have a personal loan with nedbank, last month i couldnt pay my instalment. A consultant called me to make an arrangement for the amount in arreas, she advised me that i can pay it over a period of 3months starting end of July and i agreed to that.on the 25th june nedbank debited my account with R2600, and i have been calling since monday trying to get assistance,i was transferred from collections to personal loans to lega to cheque account and no one could help me, i have spoken to Lerato a teamleader that promised to call me back she didnt, i spoke to zandile she placed me on hold for 5mins.i have spoken to more than 15 people with no help,i have spent R200 airtime tring to get this fixed.i have logged a complaint to complaint people nobody has called me back.i have been getting nothing but terrible service from nedbank,i have debit orders going off my account that i dont know off.you say all your calls are recorded.pull the record to see how many times i called and how many people i spoke to.