Horrible Customer Experience and untrained staff!

I wish there was a zero rating. Such terrible customer servicing touch points and staff aren’t trained. All they’re trained for is selling products! My contract has ended and I’m still being billed. After I call the call centre, no one can assist me and no one knows what to do. I have emailed their complaints mail and they responded with a generic response after I spent time detailing the issues faced. As a paying customer I expect more!