cold-calling
US /ˈkoʊldˌkɔːlɪŋ/
UK /ˈkoʊldˌkɔːlɪŋ/

1.
the practice of making unsolicited calls or visits to prospective customers in an attempt to sell goods or services.
:
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Many sales representatives dread cold-calling because of the high rejection rate.
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Effective cold-calling requires persistence and a good script.
1.
making an unsolicited call or visit to a prospective customer in an attempt to sell goods or services.
:
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He spent the morning cold-calling potential clients.
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The new intern was tasked with cold-calling businesses in the area.