The PESCO complaint number can be contacted at any time of day or night, seven days a week. During daytime hours, the facility is manned by experienced operators who will ensure all calls are handled efficiently and professionally. PESCO customer service number also operates on a 24-hour basis during weekends, so you can contact PESCO and feel free to discuss your issues with PESCO. For any sort of complaints, please contact the following PESCO complaint number: 111-000-128, 9212010, 9212028, 9212037