Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.
I don't know how the law works in America with regards to these things, so I'm going to suggest the honourable thing and phone Dell to explain the situation. Above all, REFUSE to pay for the return costs yourself if they ask it of you. It's their fault and they should pay for it.
Hey...
HDMI and DVI use the same signal, so all this adapter is doing is discarding the audio pins on the HDMI and rerouting the video signal pins to the correct location on the DVI cable.
You should be fine.