Equerries outstanding for months

I first complaint about the over billing on this account 4 months ago. 17 emails later and nothing has been done by 5 people within the customer care department. In particular, Mbali Moleolang has been completely useless and unhelpful. Sad state of affairs, but no-one cares within MTN to resolve these issues. no person has taken ownership to resolve these issues. I have run out of options as no-one is answering my emails or their sms lines.