Theft from MultiChoice and poor service

I had a DStv compact account with MultiChoice for over 10 years. In December 2019 I cancelled my account. When I was supposed to be refunded in January 2020 they said I must wait for sometime so as to ensure that there were no outstanding amounts. I then enquired on 26 April 2020 about my refund which had dropped to R 2043 from around R 2700. I told the agent assisting me at that I was not happy about that, she did not care about it. On 5 July 2020 I logged a new refund query (reference numbers: ***4, ***6). I had engagements with Thando Moloi, Noelan Naidoo, Happyness Shabalala and Nompumelelo Buthelezi. They then requested proof payment. I sent the proof of payment and in that process I picked up that since 2017 DStv has been over charging me on my yearly subscriptions. They were making me to renew earlier every year without proper credits afterwards. I indicated this to DStv MultiChoice on 6, 7, 8 & 9 July 2020. I indicated my dissatisfaction with how my refund is being handled. I always speak to a different agent everyday. I also indicated this dissatisfaction on DStv customer survey. No one has ever called me to hear my side of the story. DStv customer service is horrible.