Non-responsive. Crazy billing.

I have been receiving invoices with varying amounts, with water usage of between 3 to 5 KL. Now my recent invoice says I have used 55 KL and charged me almost R3 000 for water for a single person flat. This is almost 10 times the usual amount I get invoiced for.

I have emailed and emailed, without any response. I need to query this amount because I cannot possibly use 55 kiloliters (55 000 liters of water) alone when I'm hardly even home all month.