Carshield Would not cover repair claim on a covered repair per my warranty St. Peters MO

Last Monday I took my car in to be checked for a check engine lite and starter trouble. Repair shop tells me there's gas in my oil from a bad fuel pump and that this issue has also caused the timing chain to wear and need replacing which is the reason for the starter issue. It is now Wed of the following week almost 10 days later and they're denying the claim saying the fuel pump regulator is what's bad and that part is not under warranty.

No one has said anything about a fuel pump regulator. The carshield adjustor has done everything in his power to deny the claim and even make up something that needs replacing when in actuality it doesn't need replacing just the parts that were mentioned.