Who called from 31230000

This company is Abacus International they have been ringing me at work for 8 years, they hang up on me in mid conversation.  They are rude and will not stop calling me.  I just hang up in their ear now as soon as i hear the company name.  when you call the number it asks for a pin code

Called again today.  Just calling and hanging up.

Yes!! They call us all the time at work they have gotten all our managers details and ask to speak to the GM by name, they never leave a message, just that they'll call back another day.  I googled Abacus Group and they are on the ASIC list of unlicensed cold callers. so just keep hanging up on them.  They also lie, it is the exact same voice every time, but she always has a different name!!

Just had another call.
They now call themselves:  NEW WAVE. Just as annoying. Put em on hold and let them waste their time.

just had a call from global vantage saying they were representing amex - told them to pxxx off!!