Request for removing the comment of the phone number

They call asking if you want to purchase medical alert. I recieved at least 10 calls this week. I asked to have my number removed and they said it takes 24 hours??? I have received two since. The last one was beyond belief...I told the lady it was the 10th call from then in two days and to remove my number. She said ok but did I want to by their medical alert.. serioulsy!! Ugh,.. hopefully they remove my number. Very very frustating,