Wraps Adorn LLC review for Mailchimp Email SMS Marketing

I was using Mailchimp for 3 years with no issues up until today. Like normal, I scheduled a campaign last night with my correct number of subscribers and this morning my campaign delivered to only a fraction of my subbies because 1,200 subscribers had been deleted by Mailchimp. What is going on? This is the busiest shopping season of the year--Can someone at Mailchimp reverse this error?