DSTV debited my account in error - concerned!

I disconnected my DSTV in 2019 and did not reconnect the services. On the 23rd of September I received a sms stating that my debit order for DSTV will go off on the 26th of September. I was very confused about this as I disconnected my services a very long time ago. I called DSTV the same day and the lady said she needs to investigate and get back to me the same day. She did not. I called DSTV on the 24th of September and the lady said it was a system error and they cant do anything to stop the debit order but once the debit order goes through they will process the refund. The debit order went through on the 26th of September. I called DSTV today, 27th of September and the person I was speaking to me indicated my refund is processed and will appear in my account in 7 to 10 working days. This was all inconvenient for me to track and ensure the refund is processed for an error that was done by DSTV. I did not expect something like this to happen for a company as big as DSTV. Very concerned about this as I need to now monitor closely this does not happen again.