Cancellation of TV license

My business closed on the 31st of January of 2017. I emailed the SABC (numerous times now) and informed them that the business has been closed and the TV set has been given away as I have no need for it. Yet I still receive calls and emails demanding payment. This is getting ridiculous! Can you please just leave me be as 1) business does not exist anymore 2) I do not have the TV anymore nor do I have the details of the person who now own the TV.