Product: Credit card or prepaid card

I did a complaint XX/XX/XXXX and have no yet received the response I have called and left voicemails with no return call nor have I received anything in mail so Im submitting another complain My card was charged without permission for one change and another charge which is duplicate charge I was suppose to be receiving a refund for. I rented a vehicle through XXXX for dates XXXX in XXXX XXXX XXXX On XX/XX/XXXX I was in a dispute with my boyfriend who left me stranded and took my rental key in XXXX XXXX which I had called XXXX to pick me up and give me a new vehicle upon swapping vehicles since I didnt have the key at the time I was informed I would be charged XXXX for the key and taxes and once I returned the key I will be refunded my car was on debit lock so when they tried to charge card it was declined which I have attacked the XXXX XXXX said it was declined but said its ok because I have to add an extra day fee so the the total charge that day was {$810.00} which was key fee and an extra day rental fee because it was suppose to be returned to XXXX XX/XX/XXXX but an extra day had to be added due to this issue. On XX/XX/XXXX at XXXX at Lax XXXX rental I returned the key I asked for a recipe the was not able to give me one so I took a picture of me giving the XXXX XXXX the key on hand with they key details so it would be seen it was for previous rental. The worker advised me I would receive a refund in 3-4 business days. I waited a week and checked my back about to find another charge in the amount of XXXX which was not authorized I called XXXX and they informed me it was a key fee at this point im frustrated because I was suppose to receiving a refund for the 1sXXXX key fee and I advised I already was charged and was suppose to be receiving a refund. The rep at XXXX on the phone had told me he could not seen the charge for XXXX dollars and after that I advised I will just dispute with my bank for an unauthorized charge and a refund charge. The bank did not properly do the claim because they upheld false charges from a receipt that doesnt details what the charges were for after I already explained on the claim I was charge 2 times for a key that I have picture proof i returned I reached back out to XXXX XX/XX/XXXX and spoke to a supervisor names XXXX who informed me he did see both charges and would issue a refund of XXXX and I would need to show proof of key return for a refund of the second charge of XXXX. He provided me an email which I sent the picture to and a week later I called to check on the refund on XXXX and if the picture was received for the 2nd refund of XXXX which I was advised XXXX did process the refund but it was rejected because I already disputed through bank and a contact they have with disputes is that it is no longer they responsibility and whatever outcome the bank gives is the final. I reached back out to the bank with no assistance from the mangers or anyone and out of XXXX dollars. So Im filing a formal complaint and will be sending a demand letter for the charges including damages fees and this gas cause. I submitted one claim Number but there are 2 one for {$810.00} and 2nd for {$440.00} both claims are not in my portal anymore so idk if ones attacked are correct