i paid WA R489 in advance for May, then learned that they'd dropped their prices so i phoned to check my account balance. Nademeah said the account showed zero. strange - either the payment had been received in which case i should be R100 in credit, OR the payment had not been received and the account should reflect R389 owing for May. to cut a long story short she eventually conceded the R100 credit balance. to give WA the benefit of the doubt they might have an account system that only calculates at month-end (which Nademeah said), nevertheless it might be a good idea to check up on your account if you overpaid for May.