what do you do to prevent them using my phone as a switchboard

I have had five phone calls from (08) 7310 0942 in the past 24 hours.  I simply don't answer.  If they had genuine reason to call they would leave a message but don't.  They are simply an irritant and this type of harrassment should not be allowed and should be criminalised.

This is NOT a Woolies number they are eitehr 0861 or private number

Got a call from this number. A very rude "lady" looking for my wife. She knew the name etc and had all the information.Why did we, the law abiding people, go through RICA for this nonsense to continue!!!  ICASA If you want to look after the consumers I suggest you focus on these issues and stop being toothless with no follow through and policing of the policies you implement!!  

OHh my god ,i got the same nummber today ,,,when i answer the person hangs up.i tried calling them back but it rings and then goes engaged.Its annoying and irritating .please anyone help

Next time they phone I will answer with f... off!!!!