driving me nuts, keep calling - marketing

Called and said I had entered a competition to win an iphone They had all my details and when I asked what the name of their company was because they were asking me personal questions he hung up on me.

they called me twicw and i did not know anything

Called me and said they were looking for a 'Julie' but then the person started asking personal details ... Sounded odd ... They then abruptly hung up.

Called saying wanted a Julie, but I now question if he was actually after other things more than just Julie?!

Called me ... I answered and they hung-up... I returned call and it went to message bank, but they did not state who they were...

Dodgy!

Called me in working hours. No message left.

I called back number (07) 3333 7928 reached voice mail but did not say for what company.