Telkom se P

I am trying to cancel my daughter's Iphone contract which expires this month with this useless company. I use MTN and there is no way to contact them from another service provider. Their app is also up to ****. They have all these ways to contact them on the app, but none of them work. I'm also trying to call the Telkom branches in my area, but none of them answer their phones, what the hell......