I' live alone but am paying for another families water usage

I've sent numerous emails mentionioning that the water meter number displaying on my invoice belongs to another unit. I live alone and hardly use water but my water account came to R670,11 for last month. My laundry is fetched, washed, dried and returned to me by a family member. The only response was an image of the crossed meter piping which I've sent a while ago but no action/ response has been received since then.