Thrive Market Unauthorized membership charge 2 months after telling them 3 times I wanted to cancel membership! Internet

I received an unauthorized charge for $29.95 for a 6 month membership.

I redeemed an offer for "free coconut oil" on July 17 2016 that included a $1.95 charge for shipping. The terms and conditions indicated that I had 2 weeks from the time my order was shipped to cancel.

On July 21, I indicated via their web form that I would like to cancel my trial. I received an email response on July 22 that suggested I give the trial some more time with an offer to extend my trial by one month. I replied on July 27 that I was unhappy with their prices even with membership and would like to proceed with cancelling. They wrote me back on July 27 with an offer for a 6 month membership for $29.95. I did not agree to this offer.

I have told them 3 times that I do not want a membership. Prior to this dispute, I have had no contact with them since July 27. I have not logged into my account or visited their website or taken advantage of their services in any way. Yet suddenly 2 months later, they have charged me for a membership out of the blue.