Query not resolved after 3 months /6 follow-ups

On 11 August 2015 I reported that a recurring SMS bundle that I did not request was charged to my account, after receiving my first statement after an upgrade. I requested that the SMS bundle be removed and charges be reversed. Subsequent to this request, correspondence on this matter was sent to customer care on 10 Sept, 17 Sept, 21 Sept, 29 Sept, 8 Oct and 13 Oct. In 2 instances details on my account was requested to rectify the problem. Just received my latest statement, and I was still billed for the unwanted SMS bundle.