Not sure what this company represents but the CSR ...

Not sure what this company represents but the CSR stated his business name and started asking for my birthday. I asked why and he said he will tell me once I tell him my birthday. I asked if they are a debt collector for health care, as usually all of my hospital bills go directly to collection agencies since around 5 years ago. I think this is normal nowadays for most people. I asked if this is debt collection if they sent me a bill in the mail. He said yes. I asked if he could send another bill because I didnt receive it. I told him my address to send it to and asked smugly, "you will give me your address but not your birthday?" I then went into blast mode. Who the hell do you think you are? Have some respect for you clients, would be clients, or whoever you are trying to scam. State what your business is before demanding my personal information.