How possible is this??!!??!!

I received a call last year around July from Nestar, telling me that my contract was up for renewal. I told the operator that I was not interested because I was selling my car (which was already on the market). I further told him that I wished to cancel my contract. <br> <br> At the time I was offered vouchers for Musica or Look & Listen (which miraculously were never spoken of once I said I was cancelling). Since that conversation I have been in and out of the country and have just realised that money is still being deducted from my account for the tracking device.<br> <br> I spoke to Natasha who escalated the matter, but the voice recording (from 2013) was a check to see if my account was up-to-date. And according to Netstar, there was no communication with me in 2014. <br> <br> I find this far too convenient. How can I make things up with as much detail as the voucher.