Telkom Does Not Deal With Complaints

I amended my telephone account last year, at the Hillcrest -KZN branch, to get the over 70's discount. My account number changed, as did my residential address and my bill is much the same. I contacted them via various channels to request the verification of my over 70's status and my correct address but received no response! The Hillcrest office said they no longer handle queries! How on earth do I deal with Telkom accounts?