have even received phone calls on my personal cell phone
For this, if you are in the US, first, if you have not already done so, add your personal cell phone # to the do not call list.
Then, for any of these calls, first collect the business names/info and names of those calling (which they will likely give, being salespeople). After you get that info written down, then inform them that they are in violation of the do not call law and that you are reporting them to the FTC for violating the do not call law.
And, of course, follow through on reporting them to the FTC:
Comments
For this, if you are in the US, first, if you have not already done so, add your personal cell phone # to the do not call list.
Then, for any of these calls, first collect the business names/info and names of those calling (which they will likely give, being salespeople). After you get that info written down, then inform them that they are in violation of the do not call law and that you are reporting them to the FTC for violating the do not call law.
And, of course, follow through on reporting them to the FTC:
https://www.donotcall.gov/faq.html
Doing so just might scare some of them into either removing your number, or adding it to a block list so they don't call it anymore.