JPMorgan Chase Credit Card Complaint

JPMorgan Chase Credit card department,

Billing disputes Nevada

I have contacted Chase several times that I do not owe charges to - - Gift Cards. They claim I never returned them, I provided a tracking number that I did. They claim I used them, I showed proof of the gift card denial of charge at a merchant. I filed a dispute back in -/-/- and they tried re-billing me four months later. Then they tried rebillingme for another charge two months ago. The charges were approx. $5000.00 each, totalling $25000.00. I am very upset and this is not fair. They have 60 days to resolve my dipsute which they did resolve it in my favor. But now they changed their mind by re-billing me and saying that they are valid. They even sent me a letter saying that they were resolved in my favor. This was on - different credit cards - ending in - and -. They can not re-bill me four months later and nine months later. I have even contacted them more than multiple times. They told me they 're closing down my credit cards with them and ending my relationship because of false disputes, which I did not do.