The mother of a boy who was violently attacked and had his phone stolen by a group of eight teens at Highpoint says nobody stepped in to help her son.

Jasmine Moey's son had just watched a movie at the Maribyrnong shopping centre when he and a friend went to the toilets on Friday, January 21 about 7.15pm.

Ms Moey told 3AW radio that once inside, the two 14-year-old boys were attacked by the eight teens.

Her son was bashed and robbed.