Final Letter of demand received after cancelling my TV License

We emigrated from South Africa last year and I contacted the SABC to inquire about the procedure to follow to cancel our TV license. Based on their advice and special forms which they emailed me, I completed, signed and submitted my cancellation to the SABC. After having cancelled my SABC TV License I was then asked to submit proof of our exit flight, so I submitted this also. I then contacted the SABC customer service desk to follow up and they informed that if I have submitted my cancellation then I should ignore any subsequent emails. However today I have received a final letter of demand indicating that my account has become overdue!

Apart from the lack of professionalism, this is totally unacceptable and ******** given that the account has been cancelled and no problems or queries have been raised by the SABC to the contrary.