No response to account query since 6 January

Cell C debited my account with R2 520 on 2 January 2016. On 6 January, I called and queried the amount. The account states \data usage\" without specifics. This is my son's phone and he hardly ever has the mobile data on as we have wifi at home. The query was to be escalated to data enquiries. After numerous follow ups, I was told on 15 Feb that the query was cancelled due to insufficient information. A new query was logged. I spoke to a call centre agent on 8 March and was told that my query had exceeded the time limit for queries (90 days). I provided the original ref no and date and was assured that my query would be sent to call centre escalations. I am STILL waiting. I have been beyond patient and cannot understand why nobody can get back to me. The 2 reference numbers are: *** (06/01/2016) and *** (15/02/2016). Please can someone help! "