The new number on my cell used to belong to someone with a debt. No matter how often I explain that the person they want is not and never will be available at

The new number on my cell used to belong to someone with a debt. No matter how often I explain that the person they want is not and never will be available at this number again, they keep calling as they sell the debt and the info to new people. So they continually robocall my cell phone chasing someone who isn't and never will be at this number. I do not have and never have had any unpaid debts to begin with. I had to install a call blocking app and I just keep listing new numbers each time. It doesn't buy very much peace, but it blocks enough calls to be worthwhile.