Bad Service

My first month with Nedbank but they giving me headache already. I have an account with MFC and my account was in arears but I app**** for 1 month extension on my contract and I was told that my 1 month extension has been approved by the collection department. That was on the 12/04/2018. To my surprise, on the 25/04/2018 they did a double deduction on my account without my consent or consulting me. I called MFC and they promised to reverse 1 debit as they can see that I made arrangements already. To date, nothing has been reversed, I have been put from pillar to post when calling MFC and nedbank. To day is month end and I have to pay rent, but I can't because they are not reversing my money as promised. I am so disgusted by this service!!!!!