Why would customers have to supply an organization with personal information?

Most customer services require collection of personal data of customers to ensure quality service. However, the company or organization must ensure the protection of this collected information.

Mainly use Personal Information, either alone or in combination with other information, so that the organization can provide, enhance and personalize their Service and their marketing efforts.

Basically for data storage for future studies to improve business plans or to easily cascade about future promotions which is cheap marketing strategy.