Extra charges after moving out: Please explain

I rented one of the flats owned by Afcho Franklin and Hirsch building number 413. When I signed the lease I was given the option of not paying the deposit upfront but paying an extra R475 per month that I was told would form part of my deposit.<br> when I moved into the flat, the room and bathroom walls were not clean, which I communicated with the landlord, but only the bedroom was repainted and not the bathroom.<br> I stayed there for 6 month then moved out so in the 6 months i had paid R2850 which in my understanding was going towards my deposit. When moving out i was told that i would not be refunded the R475 i was paying monthly and that it would go towards fixing anything that was broken in the flat, which i agreed.<br> Almost 4 months after i have moved out i receive an sms saying i owe Afcho R2325 for painting done in the bedroom and bathroom. When i asked why the monthly deposit i was paying does not cover this i was told that the extra R475 i was paying each month was a penalty fee for not paying the deposit upfront. To my understanding and as the agent told me the R475 i was paying extra each month was going towards my deposit and would cover any work needed when i move out.