Overcharge extra months

<p>I cancelled my line with telkom in beginning of March, and paid for the April in advance just for in case to avoid any uncall for action.</p> <p>However, of course this being Telkom they have to charge two extra months where no services were provided and they slack in their job to fix this.</p> <p>I tried contacting them and now they wish to threaten me, I will take this further with the CPA as this is pure **** for trying to charge on service not render.</p>