angelina, T. and Rizki Syafril 2025. Evaluation of the Oca Chatbot System as a Customer Complaint Service of PT Telkom Witel West Sumatra. Santhet (Jurnal Sejarah Pendidikan Dan Humaniora). 9, 5 (Oct. 2025), 1692–1700. DOI:https://doi.org/10.36526/santhet.v9i5.6339.