These will help you:

Every interaction should be treated like a deal-clinching pitch.

Be accommodating and respectful.

Show genuine interest.

Say, “Thank you.”

Follow through with what you say you will do.

Use social media as a customer service tool.

Listen to what your customers are saying about you online, then respond to the praises and complaints using the right tone.

Make great customer service an engrained part of your business.

Done right, customer service can become your competitive advantage and your game-changer.

Customer service pays its dues tenfold, by bringing people back and fueling long-term happiness.

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https://nairametrics.com/2019/01/31/why-customer-service-is-the-new-marketing-strategy-for-your-brand/