My newer ones are flaky, others 20 years old are still working with converters - have you tried a HMDI to DVI converter?they did last 6-7 years but i have a old dell one in the shed and thats 15 years old and that still works but dvi only.
Might have been an error. I'd open a return request and get refunded. If the seller refused, I'd open a chat window with ebay - they haven't refused me a refund yet in all these years...