A case in point, I once bought an HP/WinME (pls don't ask) machine that came with some undocumented extra software that I didn't ask for, no surprise. The actual purpose of this "keyboard driver" system service was to keep any dialup session active, by pinging a particular IP address. That address was assigned to a company (not the Mfg or even software author) and that company had necessarily black-holed that particular IP address, which could not be changed. My firewall would light up every so often because of probing packets and ICMP coming back from that domain in response to this software on my machine doing really stupid things. I could not turn this feature off without hacking my own machine to remove this system service. Funny how removing a system service keyboard driver has absolutely no effect on using the machine, who would have guessed. In hind sight, I can not blame that company for scanning me because in their eyes I was the intruder, constantly pinging them.
If you are sure that none of that is the case, and you really don't want to disable your fw scan detection then this is what I would do. Make a copy of one of their scans and print it. Write a letter for a cease and desist and address it to their legal department, and sent it via certified USPS mail. If that does not get action then I would seriously consider turning that feature off.