Hi, it was a Bonsai Shop from Melbourne Australia and even they weren't sure!
I have been doing some research, seems like it may be a Duranta (Geisha Girl)
I suggest you search Google Images for Duranta (Geisha Girl).
I'm not sure if this species is very suitable for bonsai.
Weird that the 'Bonsai shop' doesn't know what they are selling. Personally, I would not want to buy anything I cannot identify before I buy it.
You need to know what you buy so you know what care it requires.