This question always worries the heads of many companies)) I have been struggling with this for a long time, and now I am still developing this moment. I always want the services for clients to be as comfortable as possible, the quality of service was at their best. I was trained at zendesk https://growthdot.com/zendesk-consulting-and-training/ Especially for you I have attached a link so that you can read about the services.Personally, I learned a lot of useful tricks. There are many tools that are used in customer service. It is not enough just to know them, you also need to be able to use them correctly.