Honestly the most likely thing that set it off is that Snapchat started treating your sends as spam, bulk promotional messages going out from multiple accounts at once is exactly what their filters are designed to catch. Their support isn't going to give you anything useful beyond what that bot already said. Have a look at what to do when a Snapchat account gets suspended or banned here: https://gologin.com/blog/snapchat-account-suspended-or-banned/ . It covers both how to go about getting the accounts back and how to restructure things so you're not constantly triggering their system.
