Lack of feedback

I have been trying to get a refund on my account for money owed to me since March 2017. I constantly contact them every month and have to explain the story over and over despite them having the track record. Every agent escalates the issue and allegedly report to their supervisor. This past week I have managed to get a supervisor promising me to contact me back that day before 15:00, 13th September and I am yet to receive his call. I cancelled the measly Access package and insurance as I refuse to even keep this service active despite me not using it, until they resolve the refund issue. If they downgraded my services correctly this would not have reached this stage, I mean really, who wants to have PVR for SABC channels?! If someone capable can read the case hisstory, listen to the recordings and provide acceptable feedback, this would be a service DSTV is yet to deliver. I am tired of companies taking money and not delivering. This is about a principle, if they do this to me how many other are they having this evasive manouvers with?