Contract over billing issues "cannot be corrected" not instore, not online!!!!

I upgraded my contract in Oct 2020 at which point I opted out of insurance. I keep getting billed for insurance any way, the number they give if you want to cancel insurance never gets answered and the store said that they cannot assist. Now I've moved to a town without a store and they continue to bill me double the amount which my contract is actually for and when I tried to get assistance via chat the agent ended the conversation as soon as I told her what I need resolved. warning to the wise - DO NOT GET A TELKOM CONTRACT