********* business practices

When I signed up, I was told the fees are R205 and if I needed to cancel I need to pay 5% of the remaining months I had left. Since I am moving offices when I enquired to cancel I was told that I am liable for the "discount" I received for the months I used the facilities. Really confused by this, they explained to me their membership fees are actually R450 a month and they gave me a discount and since I've now used the discount for 15 months I now need to pay it back and 10% on the remaining months I have left (9 months) This was not the information I was given when I signed up. Their facilities are not worth R450 a month, it was rather ethical of them to sneak it into my contract