DSTV cancellation fees claimed after service was cancelled a year ago

I ended my price lock contract in Sept 2018 with the required month's notice. Out of the blue I start receiving subscriber mails from DSTV. When I queried it via an online chat, I was advised that I owe DSTV R180 cancellation fee. I asked for the telephone recordings of my cancellation conversation with DSTV last year and the advisor handling the live chat confirms that no one during that phonecall mentioned this fee to me. Despite this, DSTV is stoll insisting that I settle the R180 fee so that they can close my account which hasn't been active for over a year. I've lodged an official complaint with DSTV. It remains to be seen how they'll resolve (or not resolve) this.