It is nigh on impossible to teach a tiny kitten not to do something like bite cables. You need to protect the cables a put them out of her reach.
Biting things is a typical reaction at this age as they are teething and finding their way in the world.
I am quite shocked though that a UK bengal breeder is allowing kittens to leave them at 8 weeks
They should not leave until vaccinations have been completed at 12 weeks of age and Mom has had the chance to fully wean and socialise them. It really saddens me when i hear that people are still sending kittens to their new homes so young!