Vodacom is beyond useless

I.did a premature cancellation on all my contracts 17 months ago but i still receive invoices. The latest one is for almost R17000. After numerous calls an 3 visits to vodaworld this is still not sorted out. What can i do if youf staff is not competent. All u have to do is allocate the premature cancellation discount an close my lines. Im even making life simple for you an telling u how to do your job

Cant wait for your response.