Upgrade Posing as Telkom

I was called telephonically by "Telkom" offering a new deal for a contract that was expiring soon. The deal was good. It included more data for a better monthly costs + an LTE modem. I agreed to the deal. The modem was delivered around the 3rd week of January, but my contract has not been changed at Telkom. I went to the store today to find out why this has not happened yet? I found out to my surprise that I was actually called by Cell Direct (not Telkom)! They must have had access to my Telkom data, because my account at Telkom shows that I cannot upgrade (i.e. has upgraded), but my contract has not changed (i.e to the larger data package and lower monthly cost). So, I am snookered. I cannot reach Cell Direct at the number that Telkom gave me and I cannot cancel my contract (the option is blanked out at the Telkom store). I have also tried calling Telkom's call centre, but they also cannot help me. How on earth can something like this happen??!! Shocking