Next time they call, save the number that is left on your cell phone as a new contact. Name it Pest #1 or something that lets you know they've done what you say before. That way, when you hear the name you gave it, you just ignore it. They have different codes - some only ring once, others may ring 2 X's. If you have given you're number to another company for any reason, or listed it on FB - you'll get more and more of these calls. I recently shut down a business number and ordered a land line to use to call out, (cheaper than using cell phone) I forwarded the landline to cell phone. When I hear the landline ring, I know it is someone calling that I don't know, since I don't give it out. If they don't leave a message - I don't waste time or money. If you check Google, many of these sites are able to tell you where the call originates and if the call is from a company (even one you know, but is trying to sell you something new. Interesting that I received one of these calls after about 2 years of being left alone, but because it showed up as a Pest - I could ignore it.
Be aware that there are those who may be able to hack into your phone, and/or are watching your house. They call you to make sure you're home/or not. Announcing that you are leaving for any reason - on FB or Twitter is also a bad idea. That, combined with your phone number makes breaking into your home easier. Keep your business off the streets.