Cancellation request

I was called by SDM to offer sim that will have 20G and i took out the contract. I received the sim and it was activated. I used the night surfer to update my phone sofware and some applications. The following morning i had insufficient data and as usual I was told it was used. After being ping ponded between SDM & telkom 180 & Telkom sales on 10213 I was assisted by a Zain something. On the 29th I sent a follow up and I was given a case number opened by Zain person. Lets just say it is the 17th today and I have spoken to a Sonto 0n the sales department who supposedly escalated the case & was suppose to have given me an update. I am being billed for the service i cancelled during the cool off period and it is all because the consultants wont send the request to the relevant dept. This is the new low for Telkom. I know they are bad but it seems as though there is no end to how bad the service can be.