Telkom ****

I had a telkom mobile contract which i cancelled in the last month, cancelation hed to be done online. i proceded to do that and in the comments section i ask that the number har to be made prepaid, as there was over R3000 airtime and data that was available on the account. Today the contract was terminated, but there is no airtime or data or data available on this number. How can Telkom just take airtime and data which i have paid for? Lets hope someone at telkom responds to this.