Prepaid meter - Still invoiced on old meter

Received prepaid meter on 17-08-22 and settled previous conventional meter invoice in full. I've been using prepaid meter since installation date but is still getting invoiced on my old meter. I called Customer Care on the 11th of Oct 22, where I was given a reference # and told the matter will be corrected. Also send an email on the 27th which was forwarded by them to to *** but still no correction. To make matters even worse now, I got service fee charges on my last two pre-paid purchases. They charged me a service fee of R 678.26 on a R1000 pre-paid purchase and R339.13 on a R500 pre-paid purchase which results in getting electricity units only for the amount minus the service fee.