No communication at all

After many attempts to contact your call centre I have decided to cancel my contract. I refuse to continue with the service where there is no communication whatsoever. I’ve been struggling to get my sim card activated well now I no longer need it. I did not even get the WiFi range extender as promised. I went to Telkom walk in store and got the service I deserve. I would like to cancel my contract immediately since I’m still on my cooling off period. Thank you!