If you get a call on your cell phone from these people, you can at least make it so they don't interrupt you anymore. Save their number under "Unwanted Caller" or something and then save the ringtone just for them to "no ring". At least you won't have to get up or be interrupted.
Some people also have success when they record their voicemail by first playing that disconnect tone (you know the sound - those 3 tones that get higher and repeat.). The robo-dialers seem to not bother you so much when you have that on there. You can just find that sound online and play it before you record your voicemail. Just google or look up "disconnect tone mp3" and find one you want to use and record on your phone.
This is a spoofed number. Same company calling from multiple phone numbers. If you press 1 or 2 to be "removed fromt heir list" all that your telling them is that the number they called is a good number and the calling will continue. Just hang up or don't answer in the first place!