Lost data

I stopped my router contract in March s it ws ending in April. I had more then 20gig data available on the router and when I asked consultant if I will be able to use the data after my contract ended she advised me yes I will still be able to use the data with the sim card. To my surprise when I wanted to use the router it showed no network just to find out the entire sim card has been cancelled. I went to the branch on 3 June and was promised by the same consultant that an inquiry has been logged and a Telkom call center agent will call me. It is now 11 July and no call received since then. This is **************** as I paid my contract up to the end. Poor customer service. I wanted to take out another contract with Telkom but because of this poor service I won't even consider this. Keep on robbing your customers Telkom