cancellation of contract

I took a contract with vodacom, I'm unhappy with the device I took it back cause it did not want to connect to the internet, the consultant said someone in vodacom blocked the line, so I said I want to cancel my contract it's been 3 days and nothing has been done about it I keep getting excuses I been in and out of the store 4 times, is this the service we get as a client pathetic