cancellation request ignored but service still billed for

I recently had an ADSL line installed at my business, but the installation and line activation was problematic. I phone within 2 days to report the fault and to indicate that i may wish to cancel the service. I was provided a reference number to use if I in fact wished to confirm a cancellation within the 7 day period. I did in fact call back, and was sent (as usual) from pillar to post. Finally a lady took the time to assist, but had to refer my request to the initial agent who first took my call and provided the reference number. I was promised a callback. A few days later after receiving no call back, i tried calling. She was not available, but was promised a callback. And so it went on and on and on. Eventually i was given the managers number, as he had told the agent to provide me his details. Upon calling him, i reached somebody else, who promised to leave a message for him to call back. Days later, and no call received, i called back, and there is no answer. My company has been billed for these costs in the meantime. It is sad to see that despite the promises of improved customer service, Telkom has not changed at all.