Customer Service Swimlane Diagram Template (Complaints)

flowchart TB
    subgraph Customer
        A[Raise issue / complaint]
        G{Issue resolved?}
    end
    subgraph Support desk
        B[Log ticket] --> C{First line can resolve?}
        D[Reply to customer]
        H[Close ticket]
    end
    subgraph Technical support
        E[Investigate and fix]
    end
    subgraph Quality team
        F[Root cause analysis and improvement]
    end
    A --> B
    C -- Yes --> D
    C -- No --> E --> D
    D --> G
    G -- Yes --> H
    G -- No --> F --> E

Draw a customer service swimlane diagram in Mermaid flowchart TB syntax. Use one subgraph per lane for [Customer, Support desk, Technical support, Quality team]; put each role's steps inside its own subgraph and write the edges that cross roles after all the subgraphs. The process: the customer raises an issue → the support desk logs a ticket → decide whether first line can resolve it; if yes reply to the customer, if not technical support investigates and fixes, then the desk replies → the customer confirms whether it is resolved; if yes the ticket is closed, if not it escalates to the quality team for root cause analysis and improvement and goes back to technical support. Use diamond nodes for decisions and label the branches on the edges. Output only the mermaid code block.