Apparently the auto-renewal option for your subscription has a default setting of ON, unless you change it to OFF. I learned this when, at the end of my 3-month subscription, I got an email informing me that eHarmony had automatically renewed my subscription and charged my account for the 3-month rate ($107). I never got any notices via email, and the only indication on my eHarmony page was a button to "Renew Subscription". I assumed that if I didn't take any action the subscription would simply expire. This is totally deceptive and very poor customer service.
When I called eHarmony customer service, the agent indicated that the confirmation page/email you receive when first sign up says that the auto-renewal option is set to ON, and that the company could not refund the charge. I expressed my disatisfaction with this and the agent then said she could refund $67 and have my sub end after one month. I told her that I was still not satisfied, that the way eHarmony handled the billing was very deceptive, and that I was considering contacting the Better Business Bureau or other consumer affairs organization to complain. I then asked to speak to a supervisor. The agent put me on hold, then came back and said she could give me a full refund.