DSTV / Multichoice charge me for their mistakes

I have been receiving messages about being R458 in arrears after a debit order has gone through on my bank account for the amount of R722 on 2 October (which, by the way, was also supposed to be R678, which I also queried and never got an answer about) and then got a message on 22 October 2020 that my viewing was suspended after I did not pay the additional R458. My one decoder was still working, while the other had the suspension message. When I queried on LiveChat on DSTV Website, I was told that the decoder the debit order initially went off for is active and that there was another decoder that was activated on self-services on the 7th of October 2020 and that the current overdue amount on your account was for this decoder. I was also informed my Xtraview option was cancelled on 5 October and that’s why I was charged for an additional compact plus subscription, which according to them I activated. When I asked who cancelled my Xtraview I was told an agent was dealing with my account on 5 October and they must have cancelled it. All I ever activated on Self-Service was the decoder insurance for both decoders on 5 October 2020 for the amount of R55. On the same day I also noticed I was subscribed to Showmax for an additional R49, which I have never even used or known I had it on Compact Plus, but I was paying for it, so I cancelled that subscription. After I cancelled Showmax and activated insurance on both decoders an agent called me back to offer me a reduced fixed 24 month subscription for compact plus, which I accepted, but I never requested her to cancel my Xtraview or add any additional services. The agent on LiveChat reactivated my Xtraview and got both decoders working again, but said that I would still have to pay the amount overdue since I was allegedly the one who activated the additional decoder. When I asked to be directed to someone who can assist me with the complaint, since it was not requested by me, I was told that they are the ones working with the accounts and that no-one else could help me. I am extremely disappointed with the service since it is not the first time DSTV / Multichoice has messed up my account and left me without service by mistake. I would really appreciate it if this matter was looked into and the guilty party identified, so that I don’t keep getting over-charged for mistakes made due to incompetence.