telemarketing
marketing of goods or services by means of telephone calls, typically unsolicited, to potential customers
en-GB/ˈtɛlɪˌmɑːkɪtɪŋ/
en-US/ˌtɛləˈmɑɹkətɪŋ/
marketing of goods or services by means of telephone calls, typically unsolicited, to potential customers