Still being charged for service cancelled 6 months ago

I submitted a post to hello peter back in Feb. (Copied below) 3 months later I am still getting invoices. Nothing has been done! My next step will be to seek legal advice. Mid December i went into the branch in Canal Walk to cancel mobile data contract. I was told to email [Email Removed] with the document found here [URL Removed] I emailed my ID and completed form on the 15th of Dec 2015. No response. I emailed again on 21st Dec for confirmation. No response. I emailed again on the 2nd Jan for confirmation. No response. I called and spoke to someone [Email Removed] who said he would chase it and that I would not get charged mid Jan as the notice period is 1 month. I got charged on the 15th Jan 2016 2016-01-15 TELEPHONE ACCOUNT TELKOMMOBI50***x R 399.00- I emailed again on the 3nd Feb for confirmation. No response. I got charged on the 15th of Feb 2016 2016-02-15 TELEPHONE ACCOUNT TELKOMMOBI50***x R 399.00- I emailed again today (23rd Feb). I doubt I will get a response. I want this contract to be cancelled, and these two payments to be refunded.