Don't want to be a member anymore

Last year amazing voucher call me, wanted me to join. Talked about vouchers u can get wonderful things at a discount price. I was very 2 minded about joining. Later I called them and told that I don't want to be a member anymore of amazing vouchers, I am not interested in it and I don't evens use the vouchers they send me. They told me only after 6months I can quit. What bull**** is that, you not evens a proper member with them and they telling you that you can't leave. And they still deducting there fees from my account. Please can you help finding a solution to stop this. It is so unfair.