The phrase "to message the companies" means to send a written or typed communication, usually through an electronic platform, to the businesses or organizations. Full definition
He also started a mobile messaging company called Seven, which has not yet sold. (nytimes.com)
Create an intimate image that will make your customers feel that they can message your company with their questions and concerns. (smallbusinessesdoitbetter.com)
Most people would rather message a company, and this can save time, effort, and money on both ends. (androidauthority.com)