pimsleur approach $10 turns into $250+ philadelphia Pennsylvania

I ordered a cd to learn spanish for $10.  I recieved a package with cds a short time after and was charged $10.  After a month I recieved another package with no additional charge on my credit card.  After a few months I noticed 2 chargers on my credit card from the company.

At this point I contacted the company and was told that the additional package was sent because the $10 cds I recieved was a trial and I had to call them if I didn't like the product.  If I didn't call they would start sending me more cds, which would cost over $250 with charges split into smaller payments throughout the upcoming months.

Also, I couldn't return the new cds because there was a 30day return policy that expired.