@Liton Sarker, you are 100% correct. After-sales services are often overlooked, and it is because not many businesses are thinking about long-term viability. Most people are focused on the present only, and this is true of businesses that have 2-year or 4-year strategic plans well mapped out. But if you take some time to, for example, send a survey after a sale, you stand a better chance of holding on to your client for the long haul.