pimsleurapproach PimsleurApproach.com Sent me the full CD package whitout my knowledge pimsleurapproach.com, Internet

PimsleurApproach.com Sent me the full CD package for a "free trial" following purchase of a $10 "special offer"
(hook). That  was  not  part  of the "basic  trial" for only  10 $. Later when  I  was away on  business for  about  2 months I started receiving strange packages from them and found out  that  they continue  sending  me  FULL course without  my  knowledge  or  agreement to it.

 By  the  time I  came  home I've  already received few  of those with  advance lessons and was charge after  words  on  huge  amount of 448 $ for  God  knows  what and  later received  a latter from supposedly  them  as well notifying  me that  I  own them 384$ but   they  are  being generous and  offering me  ONE TIME DEAL of  50 % off that  price. it  would go down to 192 $ only. And threatening  to  take it  further involving an  outside  collecting  agency. 
And  that   happened  after  I 've  already  been charged without  knowing it.  I really think  someone   have  to  look  in to it  and  sort  them out. That is  just  unacceptable.