Failed to provide a service but still sending the bill

We moved home in December 2016 and notified Telkom, a technician was sent out but could not set up the line so we were told another Department would need to come out, we were told within 10 working days. We waited and gave extra time and nothing was done! After complaining numerous times we requested to close the account.. In April (5 months later and still no service) we left the country.. YET I am still receiving a bill???