Nedbank MFC *******!!!!

So when I signed with Nedbank MFC I told them that I get paid on the LAST day of the month. They keep changing this despite me asking them on numerous occasions to change this. Now they want to charge me interest on the difference in their dates to mine!!! Whatever you do do not finance with this ******* and misleading finance house as they do not stick to thier co tracts and breach Popi act too!!