Show the channels you can handle
The National Careers Service describes customer service assistants as people who respond to customer enquiries, handle feedback and complaints, and may answer questions by phone, email, webchat, social media, or in person. That is useful context because it shows why channel evidence matters: a recruiter cannot assume that face-to-face retail service automatically proves written ticket handling, or that phone support proves live-chat speed. National Careers Service customer service assistant.
Add channel detail where it strengthens the application. For example, write "handled 45-60 inbound calls a day across billing, delivery, and account-update queries" rather than "answered customer queries". Write "managed live-chat and email tickets using Zendesk" rather than "provided online support". Write "supported customers at a busy returns desk during weekend trading" rather than "worked in customer service".
This detail helps the recruiter compare your experience with the vacancy. It also gives your CV more keyword relevance without forcing awkward phrases.