I recently watched a video called; violence in the Amazon,(A.K.A,White
slave, A.K.A, the Catherine Miles Story) The movie claims to be based
on a true story which I kind of doubt. I have searched the internet
for info regarding the so-called Catherine Miles and I have found
nothing substancial except for a bunch of sites selling the DVD. Do
you have any info regarding this? I would be grateful if you could
inform me more. Thanks.

I don't see any reason to believe that this is based upon real-life
events. The director is not a person associated with documentary
filmmaking: most of his work would be categorized as "exploitation"
movies.

Note the beginning of this synopsis from the "All Movie Guide":

"Set up as though it were a true tale, this far-out Italian potboiler
by Mario Garriazo (aka: 'Roy Garrett') begins with the reminiscences
of a London housewife and continues as a long series of flashbacks.
Catherine (Elvire Audray) lives with her parents on a plantation on
the Amazon River. On her 18th birthday, the family takes a trip
upstream and are attacked by Native Americans. Her parents are killed
by poisonous darts and Catherine is captured and then raised by an
Amazonian jungle tribe. After some adjustment to this new life she
ascertains that her aunt and uncle were the real killers of her
parents. This discovery sets her off on a mission of revenge across
the Atlantic and into another series of adventures."

http://video.barnesandnoble.com/search/product.asp?ean=631595051292&frm=0&itm=6