Unauthorised Debits Orders

I have 2 loans with Old Mutual and I made arrangements to pay R500 and R1500 respectively to service those loans but very strange on the 21st of everything month Old Mutual debit me (366.43, 496.73, 414.05, 828.10) totaling R2105.31 on monthly basis and they still debit the money we agreed R500 and R1500 on the 25th of every-month. I never authorized such debit orders to go off my account on the 21st and please people stop doing as you wish on my account. I never authorized you to debit me those amounts.<br> Can you people please fix this and stop debiting my account as when you feel like. This is messing up my credit record.<br> Please debit was we agreed upon which is R500 and R1500 that's all on the 25th of everything. If not I will be forced to cancel those debit orders than I go do bank deposit on monthly basis.<br>