They say I still owe money

Hi<br> <br> The attorneys sent me an email yesterday saying I still owe their client money but as far as I know, I made an arrangement with them last year June, for a debit order of 10 months, to pay up the R4800 that they said I owe them. Now they say I owe another R996.36-that's close to a R1000 bucks. Where does this money come from and why wasn't it part of the R4800 when we made an arrangement with the agent?<br> <br> This is ****************!!!!