cancellation of contract

Can you please let me know what is going on, some time ago I complaint about a Telkom mobile account that are not cancelled after I did everything that was required of me to cancel the contract. Your office did call me, thank you for that and your finance department also called me to verify the cancellation and even send me a email with the case number ***9. But last week I received another statement of R337.34 <br> Can someone please explain what is going on!!!!