False damage claim + citi dispute dilemma

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Apr 13, 2020
I rent a car with Avis in Italy last year. I swiped AmEx card when pick-up, signed the agreement. No signature required when return. Later I found a charge of $500+ on an EXPIRED Citi card that was used in previous rentals. So I disputed the charge with Citibank first. Since the final receipt Avis-Italy provided to Citibank only showed the repair cost, I didn't even know where the damage was. Citibank refunded me but put the charge back on my account last month. Avis-Italy replied 4 months after the rental that they found I returned with full tank so they cancelled the gas charge and adjusted the total amount to $400+. However, Avis-Italy didn't provide any proof of the damage, photos or repair cost receipt. I still have no clue of the damage. Citibank was not in Avis-Italy's favor but asked me to provide a documentation showing Avis agreed to issue a refund, or Citibank would report me to credit agencies for late payment.
Called Avis-US, they kicked the ball to Avis-Italy. Called Avis-Italy, their English representatives are always busy.
Whom should I write to, Avis-US or Avis-Italy? If Avis refuse to issue refund, how to continue the dispute with Citibank? Any suggestion? Appreciate your help!