********* Behaviour & Theft at a corporate level

I signed up for a 1 month subscription. They billed me for two subs and 3 months. R1107.00 I called and asked them to cancel my subscription, immediately. I dont mind paying the pro rata. Their reply was I can only cancel on the 20th of Jan. Which means I must pay for services I dont want and won't use. This is the height of ********* business practices.

They also received 3 x times the amount for billing me for 3 months. If this is not theft at a corporate level then what is?