Formal Complaint to Corporate

Where can I submit a formal complaint to corporate? Our business has experienced 'unplanned outages' four times this month during business hours, resulting in 6.5 business hours in which we were unreachable and unable to connect with clients online for services they have paid us for. This has been an ongoing issue, with 'unplanned outages' occurring for hours at a time at least once a month since May of 2024. When I called the customer service number this morning I was hung up on by the automated call routing because there was an active outage at the location and "an agent will be unable to fix it sooner than estimated." We have contacted customer service every time this has happened and have not been given the root of the problem, viable solutions, or assurance that there is continued troubleshooting on the matter. In January, we were routed to a Service Assurance ECC Tech who assured us she would assist in the event of future outages. When, of course, the time came, she was entirely unhelpful and chalked the outages up to 'human life' and 'catastrophe' such as 'vandalism fire hurricanes tornadoes cars floods etc.' When I called today the technician was unable to provide me with the reasoning behind the outage, as clearly there was no such catastrophe this morning, rather, this is a persistent issue that has NOT been resolved for nearly a year. These outages are curtailing our operations and costing us money, and we are entirely dissatisfied with the service.