Impossible cancellation of contract

I called in on the 28th of July to cancel two of my numbers (the contact ends on the 17th of Aug) I was told that I will still be billed for a full month in Aug and the cancellation will be done on the 31st of Aug (the call centre agent confirmed this) and I will migrate to prepaid much to my surprise when I called in there was no record of the cancellation

Upon checking my mails this is the mail I received You will receive an SMS and Email with your exact cancellation or conversion date. Until such time, your Vodacom Contract Cancellation is not confirmed. (yet absolutely no one followed up on this) this truly is pathetic