Nedbank changing the terms of our arrangement

I was on unpaid maternity leave in February and missed my personal loan payment. I made an agreement with Nedbank that I would pay the arrear amount over a period of 6 months. I made the payments from March till August. This morning a call centre agent called me thanking me for the payments but he added that they would continue making deductions until February 2016. I never agreed to this, my account should now be up to date. I hate it when a bank takes advantage, I lived up to my side of the arrangement. I will be extremely angry if Nedbank deposits my account *******ly at the end of this month.