private account debited without my permission

I am so tired off at the **** service I've received from nedbank,I have a personal loan and I'm well aware that my account is in arrears as I've been on maternity leave and then 2years later ended up being unemployed,even with not having a job I still paid my account each month with an amount I could afford to pay,I recently started working and as my company offers employees to save towards their own bonus I took the option to save as I have twins and financially they need a lot of things.Last night I got my statement from my private account I have through my employer for the \my bonus"and what do I see without my damn permission Nedbank has debited that account every month and increasing the amount they debit every month"