OnAir decoder not working.

OnAir TV sold me a decoder in October 2023, when I tried to activate it with DStv they told me the decoder is registered under someone else's name. I have contacted OnAir several times with no success, they kept on promising to escalate the matter but no assistance I have received from them. This is so frustrating for me because I am paying for the decoder but I can't use it. Please kindly assist me with the matter Peter.