Technical support is often a high-friction environment. If a customer feels a technician was dismissive or failed to solve their issue, they will complain on Trustpilot or Google. By including a 'Rate my support' QR code in the ticket resolution email, you catch this sentiment.
If a customer is unhappy, a Support Supervisor is alerted instantly to step in. Solving the issue at a higher level prevents the bad review and turns a negative experience into a story of 'extraordinary support efforts.'