Seemingly blatant and deliberate lack of customer service

Following billing errors for a number of months I tried to get it resolved by numerous telephone calls, in person at a MTN store, numerous e-mails. This is also not the first time I experience a lack of customer service from MTN. It literally seems as if they are blatant and deliberate in not resolving issues. I would receive a query number via sms and shortly after I receive an sms stating the query is closed. Still ongoing - no reply/response from MTN