classmates inc. classmates.com offered 3 month free trial, explained where to go to not be billed further, I followed their instructions to not renew and was still charged 15 dollars Internet

I was asked by Classmates.com if I would like a free, trial membership.  I was also given instructions as to how to guarantee that my "membership" was not renewed.  I followed their instructions since I was not interested in a membership, merely the free trial.  However, even though I indicated, according to their instructions, how not to renew, I was charged for a renewal.  After looking Classmates.com up on the internet I discovered this is a popular scam on the part of Classmates.com.  Many, many people were also charged when they did not wish to renew, so this is a common scam.  Something needs to be done!