To contact QuickBooks payroll customer service for 24/7 support, dial 855-200-0590. When you call, you'll encounter an automated menu. Navigate through the options provided, selecting the one that pertains to payroll support. If prompted, input any necessary account details or follow the instructions given. Hold the line until you're connected to a live customer service representative. Clearly articulate your payroll-related issue or inquiry. The representative will assist you with troubleshooting, provide guidance, or offer solutions to resolve your concern efficiently. It's beneficial to have relevant information ready to expedite the process.