Very bad service I’m so disappointed

I’ve never in my life experienced such bad service we took a fibre router from MTN the bought us a Zyxel router “from supersonic this router is not connecting to the internet I’ve been calling MTN fibre and supersonic they picking up the my R100 airtime down the drain as the so called supersonic they watsapp number they just blue tick n not say a word this is such a bad service from MTN being one of the bigger providers their service is Rea bad