If there is one thing bosses fucking hate, it's a papertrail. The papertrail protects you from being illegally exploited and from the boss lying in court about when and what agreements were made. That's why they despise you texting or emailing them anything that would be pertinent to your employment rights within the company, such as requesting a raise, taking time off or your resignation.
Ignore this shit and exercise your legal RIGHT to a papertrail. You are OWED the ability to call off via text under federal law.