Poor service

'Mtn does not care ' I reported a case at mtn for tele sales disagreement and returned gargets to the mtn store with the hope that they will investigate the matter and let the people involved take responsibility. but it is 4 weeks now and nothing happened not even a call from MTN. I have to be the one calling and/or send email for them to respond. telling me the matter has been taken to the supervisors. yet billing messages are still coming my way.