an anonymous waitress revealed how john key kept pulling her hair .
she wrote in a blog that she gained unwanted attention from him last year .
the woman had been working at a cafe frequented by mr key and his wife .
she said mr key kept touching her hair despite being told to stop .
the prime minister defended his actions , saying he had already apologised .
he also said his pranks were ` all in the context of a bit of banter '
the waitress was reportedly working at a cafe called rosie in parnell , east of auckland .