I need a customer service specialist for my website

It is an app startup in which people can either register as customers and request custom tasks such as personal shopping and delivery and the other users would be taskers who are the ones that will complete those tasks to make money. We are currently in the pre-launch phase so people are currently registering to be taskers before the app launch. I just need someone who can handle website customer service via the texting/call service provided on the website in case someone needs help signing up or has any questions about the soon-to-be-released app.