BAD EXPERIENCE with Stephen’ Performance

Send wrong part, new cable must be bad, must have been installed incorrectly, are you still calling us about this?

Wait, we only guarantee it worked when it was sent, that should put an end to this problem, and any future business.

Shady talk.
Start with no guarantee on used parts, that's acceptable.

Diagnostic services over the phone is laughable, especially when it's never their part, unless you touched it.

Call them back and ask if they guarantee to send the correct part?