I know this is less than ideal but an ex of mine has top status with WestJet and frequently flies Delta. What she does is as follows:

1. Has printed a laminated copy of the Delta benefits for WestJet fliers.
2. Has a physical laminated copy of her WestJet status card.
3. Has a printed email from both WestJet and Delta customer services confirming the reciprocal benefits.

She also has digital copies of each.

While she still has frequent issues with these bookings, she swears she is able to resolve within a matter of minutes each time.

Should she (or you) have to do this? Absolutely not but this little bit of prep has saved her major headaches.

Good luck!