Still billing me for no service

<p>I canceled my adsl internet service and landline on 30 Jan 2017.<br />I then received an acknowledgment from Telkom that they received my cancellation.<br />This meant according to your rules that the latest my service will be canceled by will be (21 business days from then) which puts us on 28 Feb 2017.<br />It wasn't canceled,so i phoned 3 times to cancel my account.</p> <p>Eventually, it was canceled around the 10th of March 2017.<br />I then received an invoice for R815.25 on the 12th of March, which i thought would be the last one, so i settled that bill.</p> <p>THEN i received another bill R727.20 on 17 April 2017 for April's use of my ADSL line......WHICH is impossible as it was cut off on 10-15 MARCH<br />So you overcharged me for one and a half months!!</p> <p>I have tried to contact Telkom about this but,as always...no response<br /><br /></p>