Pathetic service

I have reported a conflict in data billing and data received on both my son's accounts. Have emailed customer care on 2015/05/04 and 2015/05/19 where I did receive emails back and was told the matter would be resolved within 7 work days. NO response to any emails on the query after that. Still have not had any reply or response on emails up to date. Very disappointed in the complete lack of feedback and service from Mtn