DSTV SHAME ON YOU!!!!

Please assist I cannot believe that a company like DStv cannot sort out my account. I had a Explorer A1 for 24 months at Price Lock, all went well. After 24 months I WANT TO EXTEND the contract for another 24 months on Price lock. I received a Explorer 3 (upgrade) which was delivered to my house. I did not open it and returned it on 9 Jan 2020 via the Couriers. I was invoiced for 2 x Explorer decoders and still are!!!! Today a called as I AGAIN received an email indicating that I will be billed for 2 Contracts!!! I called and was assisted only to find out that the old existing Explorer A1 is not on Price Lock and the Explorer 3 (which I returned unopened) I have Price Lock on. When I explained that I only want the ORIGINAL contract to be extended, all of a sudden my DStv is disconnected !!!! After three calls it is still disconnected. I had enough!!! Can someone at DStv just have the respect and sort this out for me???? Is it so difficult to just continue with a contract which I had for 2 years??? I am GATVOL!!! The best is that all staff try to help and are friendly, but the service I end up receiving is NONE EXISTING!!!!