Refusal by CarTrack to refund me

On 15/04/18 CarTrack deducted a monthly premium from my bank account for an account that I cancelled before I opened a new account with them. When I lodged a query with them in this regard, the company told me about a notice of 14 days before cancellation. In response, I indicated that such information was never brought to my attention when I took the telephonic contract with them in July 2014. But the consultant was adamant that the recording of the agreed to contract would reflect her version. I then asked the consultant to send me the 2014 recording so that I can also satisfy myself as I am steadfast that such a clause was never communicated to me. She undertook to send me the recording the following day (18/04/18) and further undertook to give me a follow-up call. However, she never fulfilled her undertaking. I then called CarTrack again and spoke to a different consultant, who also promised to send me the recording as speedily as possible- accompanied by a follow-up call on her part. But to this day that has never happened. I have also written numerous emails to Cartrack registering my frustration with their non responsive attitude to my query, reminding them about their failure to send me the recording that they rely upon to back their claim and refusal to refund me. However, that has also fallen on deaf ears.