Got a call from this number. No voicemail

I've never done business with this outfit, but they continue to call my phone, offering ED meds. I tell them:
1: stop calling this phone number
2: I do not, nor have I ever, done business with you.

then.... they start to argue, telling me I should order their meds, AND that I've do so before.. BS

I get phone calls from this number every day. I dont know this #,and when i pick up the phone and say hello they hang up. Dum

DO NOT CALL