Denial on claim - need someone from GS to contact me

Very frustrated with good sams extended service plan. Have had it in the past with a class a diesel pusher and a travel trailer and was satisfied with the coverage and results. Bought a super C a while back that we thoroughly enjoy and have not had one issue with it. Was on a trip before the holidays and noticed the temp getting warming than usual. all of a sudden the alarm goes off temp gauge swings all the way right then back to normal. I pull over check everything and all seems ok. dropped off at the shop when we got back to check things out and they found exhaust gases in the coolant. Tear things down - passenger side headgasket gave up. Good sams sends out inspector who had no experience with diesel super c's - shop shows the inspector where the failure occurs....long story short a month later after too numerous to count calls to good sams by the shop and myself, detailed information sent to good sams by the shop claim is denied for pre existing. So I would love to have someone from the review board reach out to me via PM to discuss this as. not a happy camper nor a good sams advocate at this point...