Not a human available to do anything but take your money. Core return will cost you half in return shipping. Enough must follow rules for returning cores they could literally make any excuse to deny payment.
Have a question that "help" doesn't address?
"Well too damn bad."
'We will never chat or talk to you in person... ever!"
Just buy your part local because it will end up costing you the same in the end.
Never, ever, NEVER again.