NO customer care and excessive billing for no service

I cannot get through to any customer care centre via the nr provided on the rain website. Also, there is not even an email address to send my query to. As far as I know I am on a month to month contract. However, according to the stats on the rain website I owe them R2000 for services that was not even used. I only bought a simcard from them - NOT a router that I had to pay off.