A supplier shall record customer complaints according to the following categories: Call center operations; Unauthorized charges; Enrollment; Accuracy of billing services; Contract renewal or cancellation; Deposits; and Change in customer’s billing method. A supplier providing supplier-consolidated billing shall retain for a minimum of 3 years the following information in a monthly format to provide to the Commission and the Office of People’s Counsel upon request: Number of complaints received by the supplier from customers for the categories identified in §A of this regulation; Disputes escalated to CAD; Number of times a supplier did not charge a customer the correct amount, excluding when a utility invoices the supplier an incorrect billing amount or meter reading; Call center metrics as described in COMAR 20.53.08.09; The number of customers dropped for nonpayment; Total arrears resold to the utility, separated by residential and nonresidential; Average customer arrears repurchased by the utility, separated by residential and nonresidential; Number of customers to whom the supplier provided budget billing; and Number of bill adjustments initiated by the supplier. A utility shall retain the following information for supplier-consolidated billing disaggregated by the supplier, in a monthly format for a minimum of 3 years, to provide to the Commission upon request: The number of customers receiving supplier-consolidated billing services; The number of customers who were dropped from supplier-consolidated billing by a supplier for nonpayment; The number of customers who are using net energy metering or community solar; Total arrears repurchased by the utility; Average customer arrears repurchased by the utility by residential and nonresidential customers; Volume of retail sales and demand in supplier-consolidated billing; Number of customer enrollments rejected by specific eligibility requirement; Number of customers rejected due to energy assistance; Number of customers dropped from supplier-consolidated billing due to energy assistance; Number of customers who enroll in supplier-consolidated billing that were on budget billing at time of enrollment; Number of times the utility failed to provide charges to the supplier within 3 days; and Number of bill adjustments initiated by the utility for supplier-consolidated billing customers.