Typically most corporations use a single Corporate Agent, which is convenient for anyone sending correspondence that way. Sometimes this function is performed by one of the large law firms. What This Means The sole function of these agents is to receive notices sent to the company. Typically these are law suit complaints and the like. This means that any notice sent to a Corporate Agent will go to either the corporation's law department or top management.
Someone writes a short memo or directs questions to the cognizant manager of the company.
Same as above, but the legal department advises the cognizant manager to change the way they are doing business in order to stop violating the law. The last thing the manager wants to hear about is legal trouble. As you can see, any notice you send through the Corporate Agent must be professionally reviewed by someone who is paid to consider such things. You may get a letter from an automaton, but the letter will have gone to upper management first. State that you wish the company to comply with a particular law or the equivalent.