Unable to cancel VDSL

I have been trying to cancel my VDSL line since Feb 16. I took out the contract in October 14. The line speed I took was a 40 meg line. At installation is was told I could only get 20 meg. 3 months later I was only getting 15 meg, but still paying for a 40 meg. In Feb my line was down and I was told that I need to downgrade the speed as I am 1.6km from the exchange and the speed is causing sink issues. I requested for the line to be cancelled on the 18 feb 16. I was charged for the full month at the end of Feb. When I contacted Telkom they said that I had to pay the full month but the cost would be reduced in March. Below is a copy of the chat. Mid April I went to the Fourways shop and asked them again to cancel from the 1 May. The line is still not cancelled. Could someone please help. Thank you for chatting to us. Your conversation with the agent is available below: Please hold for the next available Agent. Welcome to our Customer Care Centre. You are currently being assisted by Nokukhanya Mbesa 12:51:20 PMNokukhanya: Thank you for contacting Telkom, you are chatting to Nokukhanya, how may I assist you? 12:51:44 PM You: Hi, I would like to find out if my ADSL line has been cancelled 12:51:57 PM You: my number is *** 12:54:11 PMNokukhanya: Please hold while i check for you. 12:54:35 PM You: thanks 12:56:22 PMNokukhanya: Have you requested for only the adsl line to be cancelled? 12:56:32 PM You: That is correct 12:57:59 PM You: but it seems that I am still getting billed for it 12:58:09 PMNokukhanya: Yes, the adsl line is cancelled you just have the landline only thats active. 12:58:45 PM You: then why is my bill so high. 12:59:38 PMNokukhanya: The adsl line was only cancelled 18/02/2016 so it was still gone be billed for this month. 1:00:08 PM You: Do you know what my bill will be? 1:00:23 PM You: excluding calls 1:01:06 PMNokukhanya: R189 pm 1:01:15 PM You: great thanks for the help 1:01:22 PM You: enjoy the rest of your day 1:02:01 PMNokukhanya: Thank you for using our Telkom Chat Service, please enjoy the rest of the day. © Telkom SA SOC Limited. 2014 All Rights Reserved.