TY CONF TI APPLYING MACHINE LEARNING TO PREDICT REPEAT CALLS AND PREVENT REPEAT CALLS IN TELECOM SERVICE KW telecommunications KW SLA KW repeat calls KW repeat visits KW machine learning KW predictive analytics KW imbalanced data KW MLOps KW CRM KW OSS KW Workforce JO MODELING INFORMATION SYSTEMS AND TECHNOLOGIES – 2026 AU Avilova, O.A. AU Yagodkin, A.S. AU Kladov, A.V. PY 2026 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov