Doubled charge by DSTV

Good morning. My decoder just stopped working and I called Dstv for assistance and they promised a new decoder which I suspect they disconnected ours because it was an lld version.to cut the long story short, a new one was installed and I agreed to add a 2nd point at a cost of R70 a d the agreement was that the new one will be +_R50 more and I was happy . My November bill came at R1300 which was almost 3x what I was paying I tried calling them but was unsuccessful. On the 27th of December I went to the Bank and reversed the debut order and managed to get hold of DSTV. They checked my account and confirmed that I was double billed, the lady tried to rectify my bill but vojld only cancel the ?Disney + Channel, by the way I don't eve have small kids but that was added to my package. The 2nd connection point was not done and I was still billed for that. December bill came for R1100 excluding the Disney Channel and my bill still not fixed. Dstv also decided to cut their conne toom yesterday not fixing the problem I need assistance to get this matter resolved a d would also want to cut ties with Dstv. They must come pick up their decoder and fix their mess.