TELKOM WONT CANCEL MY CONTRACT

I have an expired contract with Telkom Mobile which I wish to cancel and port to prepaid, and did so in the Eastgate branch on 11/12/2015. The branch assured me that the contract would be cancelled in 72 hours. I called the call centre today, 18/12/2015 and was informed that I must first wait 30 days for the retentions department to even contact me before the contract can be cancelled. This is absolute nonsense, as my 24 month contract expired 2 months ago already. Hogwash! Case number ***0.