The number of contract accounts are not a distinct number of accounts but the number of account occurrence per relevant category. It is therefore possible that the same account could have water service on the same property that falls in more than one category. E.g. a Sectional Title block with Commercial shops on the ground floor and residential flats above the shops. The same account is linked to both the water used on the Commercial tariff as that of the shops being billed on the Domestic tariff.
Also note that these values (“Amount”) are excluding VAT.