Misrepreprentation and an Nuisance

I was made to join Easy Holidays in December 2016.They made it seem like it was possible to opt out over the course of the year. They did not divulge to me that once I join I had to make sure all dues are paid up. They made it seem like I could decide to cancel and that would mean no benefits for me which was OK.I had only 600rands when I joined which I used and within a month I then realized this was too much and wanted to cancel. I informed them of my wish to cancel. I had not used any of their services at that time. So they rep**** my mail that they were going to cancel. Surprisingly I now keep getting emails that I am in arrears and have to pay an outstanding amount of 133k (rands). There is no way I can pay this. I do not have the funds and am no longer interested. I want these people to stop pestering me, there is no way I can pay for something I do not want and do not intend to use