I cancelled my Apple/Goldman card after they were totally useless on a transaction dispute. Frontier Airlines gave me a "refund", and printed me a "receipt" for

I cancelled my Apple/Goldman card after they were totally useless on a transaction dispute. Frontier Airlines gave me a "refund", and printed me a "receipt" for it, and then later refused to give me the refund. When I showed the "receipt" to Goldman/Apple support they would chew on it for 4 weeks and then come back with. "Judgement for merchant. Reason: no evidence." I'd say: what was that "receipt" they printed, just a lie? And they would say "sorry" and reopen the investigation, repeat the same result. Lame. And I will try to avoid Frontier for the rest of my life.