Continued poor service from DSTV

I have spent another hour getting frustrated with dstv. I again wrote to them to ask for two things. Firstly proof they have cancelled my debit order. Secondly I asked why I have not been reimbursed regarding my bank charges. They say , via e mail, that they have credited my account with the cost of the bank charges. Therefor they accept they are liable for them. I wrote to them last Thursday and asked how it was possible to credit my account , when I have cancelled my subscription. I have subsequently written 3 times to them , asking for a response. None has materialised. I then tried their whatsapp line. No luck there either- they cannot help. Then phoned. After numerous issues, with people not phoning me back, I decided I would bear the cost of the call. I only have a cell phone. I spoke to someone who told me exactly what I knew already, and could not help me. After 13 minutes of my time, I had nothing. I asked her what I should do now, and she said she did not know. Suggested I e mail. Tried that. I know that the issues I am raising may seem trivial. My bank costs are minimal, but to be told they can't pay them is unacceptable. Clearly the cost of them doing so is deemed too much for the small amount. But it is ok for me to pay for their mistakes. The second issue is I asked for proof that they had cancelled my debit order. Saying so is not enough. I have been told that before and they still took money out of my account. They simply will not do it. As a matter of principle I cannot simply let this go. I received swift replies before after posting on this site. Seems like now they have decided to ignore me. What a dreadful company.