Going against Agreement

My husband, Mohamed Ikraam Kader has a loan account with FNB which has been in arrears due to some financial set backs.<br> I had made an arrangement with them to start paying<br> R400 per month as that's what I could afford. This arrangement was done on reference TCCPDCMXAS***.602825 . This month the loans division debited an amount of close to R1600+ from his account. When we called FNB upon around 12 attempts, we kept being transferred and no one wants to take the responsibility of assisting us. I was also advised the account was handed over and upon speaking to the agency that was handling the account, I was advised by them that they did not do any debits as yet. So the loans division not only handed the account over but also double debited my husband.<br> <br> We need urgent assistance please, as we have other commitments to meet and today is the 31st already.<br> <br> Account holder is Mohamed Ikraam Kader .