Customer care service

Good day, I am a Telkom client I have a cell phone contract with them, the phone got ****** yesterday 03.04.2018 an since 3:30 yesterday I have been trying to contact the customer care line (081 180) & (10213) as there is no response but just holding more than an half an hour just to blacklist the phone to protect personal info as I did go in to the Telkom mobile store in Alberton City to do a SIM swap that went fast I did ask them how I can blacklist the phone as they told me I can only phone the two numbers above. Today 04.04.2018 I tried phoning again the whole day I even used the website entering my number asking to phone me back for some service, still nothing as well as the SMS service was unsuccessful. I again phoned the Telkom mobile store in Alberton City and with a reply saying they can`t help and laughing in my ear while on the phone as this is very unprofessional. If any of my personal details get exposed I will hold Telkom responsible due to the lack of professionalism. This is madness I know Telkom has a High call volumes but Surly they must have got something from my side as I used 3 different sources to get hold of them. Please could someone call me urgently in this regard to enable us to resolve this ASAP! Thanks