No Response From Customer Care

Hi<br> After trying unsuccessfully to contact the call centre (4 separate calls throughout the day where I was on hold longer than 15minutes), I emailed customer care the following, and received a reference number: ***7:<br> Hi<br> My contract at MTN is ending for the above number on 17 July 2015.<br> I have no intention of renewing the contract. Please can you ensure that the contract ends on this date?<br> If you need anything further please feel free to contact me.<br> This was sent on Monday 22 June, and I still have had no response. <br> Please can someone contact me regarding this query?<br> <br> Thanks