The premium tax credit amount shown on your 1095-A was paid by the government to the insurance company on your behalf. I doubt that the insurance company will refund it back to the government easily, so that's why the Marketplace advises they can't change the form.
You could probably initiate the process with the Marketplace to try to get the funds back from the insurance company, but I'm sure it would take take time and paperwork to do so. Once Marketplace got the funds returned, they may then issue you a corrected 1095-A.
For now, though, I'd advise filing with your 1095-A as received. If it's eventually straightened out, and you get your corrected form, you can Amend your 2023 return.
Here's more info on How to Enter Form 1095-A and How is the Premium Tax Credit Calculated.
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