Misleading text messages

I signed up for Frengo after adding my mobile number from a Facebook application (Horoscopes). In the follow-on text messages they advertised a game that I could play over text. The text said:

"Std txt msg rates apply. $5.99/month." I took that to mean that a text message plan costs $5.99/month and therefore since I have one thats all I would need to play the game. I realized shortly after I signed up that they may be charging me a surcharge. When I called customer support they told me that based on my mistake I would not be refunded my $5.99. I explained that I felt the text messages they sent were confusing and misleading. They refused to listen to my opinion. I asked to somehow speak to someone on the product side that I could at least give this feedback to and they said they have no way of doing that.

I realize I'm not going to get my $5.99 back. But I hope that someone at Frengo sees this. For one the customer support needs to be less adversarial. It made me feel that Frengo was really just out to fool me. If that is not their intention I strongly encourage them to make their text messages clearer to consumers so they know what they are getting into.