Why should I pay for a servive I did not get?

Tuesday 28 May 2019 I have phoned the DSTV call center to cancel my account (28 May was also the date at which payment was due for the new month), after which it was also confirmed that there were NO outstanding fees. Now, more than a month later on 15 July 2019 I get a call that there is R205 outstanding on my account and that services have been disconnected on 4 June due to non payment. I have asked for the services to be stopped, duh! And for what is the R205???? I have cancelled my DSTV at the end date of the payment cycle.

I never ever want to do business with them again.