I was almost scammed by a website directory early this year, I signed up for a free trial which was for 30 days.
After the 30 days was up I was sent a letter chasing me for money, I called them to find out what was going on but they said they did not understand English and to call back in German, the directory was advertising they speak in all languages.
I knew something was going on then!
I found it strange as any other self respecting directory would write and inform you the 30 days was up and would we like to go ahead and purchase advertising, I had forgotten about the whole submission anyway, until the letter arrived.
Anyway I wrote and told them I was not paying their invoice as they had tried to scam me instead of offering me the opportunity to advertise or not after my 30 day free trial.
The letters kept coming and were nastier and nastier with interest! Threatening to take me to court for non payment of an invoice, I just kept ignoring them - finally they did go away and realise I wasn´t going to cough up.
I found a forum talking about their directory and it was indeed a scam so I am glad I stuck to my guns and did not part with any of my hard earned cash