A nuisance called phone

Yes, the phone really has become a nuisance for me. I can never get any peace and quiet in the house. It is always rings or buzzing. It's either the call center employees trying to push some product, the wrong number or some other totally irrelevant phone call. The caller id does help out a lot after I have identified the number and fed it into the phone. I also tell the caller not to call me again regarding these promotional items which he/she is pushing. But in some cases it does not help at all and I really do lose my cool. The only thing I really do is to give them a good yelling and tell them that I'll report them next time. In some cases, I keep the phone switched off if I've had a rough day. I am seriously thinking another phone. One I will keep only for office purpose. The other for personal home use. The home one will be a brand new number which I haven't given out to anyone. Maybe, I'll change the phone number on my other phone also.