Disreputable sales practices/phone harrassment

here is my problem with ace industrial...i own a small shop so not only being the owner i work in tha back as well...iv'e been in business for over nine years and have been recieving calls from them almost the entire time...i told them from the first call, the same as i did today "I DON'T BUY ANYTHING OVER THE PHONE SO PLEASE PUT MY NUMBER ON YOUR DO NOT CALL LIST" as for only certain callers being rude, they have all pretty much been the same and cannot take no for an answer...everytime i have to stop and answer one of the useless calls it costs me money...and as for the caller id bit that was mentioned above, the call i got this morning was listed as BBRN BBRN on the caller id so how would i know that it's ace industrial until i answer it ?i know there is no do not call list, but if you have never done business with a company and request to be put on a do not call list the company is supposed to do it...the man this morning told me he was a customer service rep and was not in the department that would add my number to the list, so i informed him all futer calls will be recorded and if they do not stop i will seek further action...you would think 9 years would be enough time for them to get the picture...he said they were persistant, i said i had another word for it but i will keep it to myself...