i have had 20 missed calls from these guys in the last 24 hours - no sign of it stopping either.

I never pick up and it always goes to my voicemail which is probably costing them money so Keep calling i say..eventually it will skint them..

Repeated calls that hang up when answered. Occasional 'noise' voicemails. Is this checking for a valid phone number?

I get calls from these guys all the time. The most annoying part is they actually leave a message that just has a bunch of noise and uses up my voicemail minutes.

Calls on most of our company phone lines. I find it really annoying and they go away only to call us again and again.

I tried to call this number back and it was out of service. What to do?

I hate these people. Truly hate them. I hope something bad happens to them.