disappointing

I am really tired of this phone and these ******** called vodacom, it was booked a month or two ago and fixed as they usually do now on Saturday it has done the same thing. Can someone advise me on what to do? The debit order runs every month but the service I get from this company is ridiculous. They have sold me a nonsense device that they know will never work normally like other phones. Is this what these big companies do to us customers? they refuse to take back this phone and give me a new working device but they do see this is a nonsense phone that will never work. I am beyond frustrated and very angry and disappointed. I still say I will never advise any of my family and friends to buy anything from vodacom. I am tired of being treated like this.