Constant phone calls

I made the mistake of taking a call and upgrading my policy recently, since then I have been phoned on my cell and I have asked repeatedly that they make a note not contact me on my cell phone but rather on the land line as we are not allowed to take private calls on the cell phone at work. The only reason that I do answer my cell is that some times it is in regard with work that I am phoned. <br> <br> I told the persons that I cannot take their call at that moment yet they persist in only taking a few minutes of my time. The first time I was busy in an audit and the person insisted to verify my details after I said numerous times that I should be phoned after 3 in the afternoon. The person just carried on so much that I got annoyed and told him to phone back later and put the phone down. This morning the same happened. The more I am telling the person that I am at work and that they should phone after 3 in the afternoon, the more he carried on. I understand that they have a job to do, but I also have a job to do. If they have to phone and check the details, they can use the work line like the first person that phone did.<br> <br> If this persists, I will have my cell phone number removed. <br>