Mercari complaint: The worst customer service experience ever

I purchased an action figure on 822021, it was listed as a like new and it was listed as 11 inches on the seller’s website. When I received the action figure it had loose joints, multiple scuff marks on the arms and head, a repainted head from the original, and a red paint spot on the head, it was only nine inches, and there was multiple paint chips on the backside. Almost immediately after receiving my action figure I emailed mercari right away, I didn’t realize it was from my other email account, so they told me to get on my account that was associated with macari and email them the same complaint. I did that, and didn’t hear back from anybody in two days ( it says if you do not contact anybody within 3 days of purchase they can’t guarantee you a refund) knowing that information I reached out once again to them, and had a girl by the name of Haley handle my situation. Haley could not have been more dismissive and rude when dealing with my situation. Mercari went ahead and rated my seller without my consent and permission so that I could not receive a refund. I purposely did not rate my seller until I heard back from somebody from the company to see if I could get my money back. Haley went on to tell me what a liar I was because I did rate the seller. I provided picture evidence from an email saying that mercari went ahead and rated the seller without my permission and it was because i didn’t rate the seller within 7 days after my purchase. After not hearing from Haley for multiple days I reached out several more times to mercari to inquire about what they were going to do about my situation. Haley finally responded and said that if I sent in pictures of my action figure and packaging that she could possibly give me a one-time fee of refunding me and accused me of not messaging somebody about my situation within 3 days (which is not true, because I messaged the company the day I received the item). After sending all my pictures in as evidence and explaining every single detail of what was wrong with my action figure it took her longer than 12 hours (per the website which you say it would take), to finally get back to me. When Haley got back to me, she only issued me a credit on mercari of $26 when I paid $40 for the toy and used a $5 off coupon as a first time customer. I messaged Haley back after that saying that I paid 40 and showed proof of my receipt, Haley then responded back that she could not do anything and that basically tough luck. Now she is trying to close the case and dismiss me. I have put in 10 days of effort into this whole dispute, I asked for compensation or asked even for a coupon for all this effort, and she refuses to give that to me. It is not my fault that the seller listed this as a like new item and hid the blemishes and scratches on the toy figure in all the pictures he posted. If he would have just listed the condition as good (which means that it has a few scratches on it) then we wouldn’t be having any issues or this conversation. I don’t understand why I have to suffer for the seller’s mistakes, I am just holding the seller accountable and Mercari accountable. With the $26 if they gave me back as a credit, I couldn’t even buy a new action figure of that brand if I wanted to. I have never dealt with such horrible customer service in my life. I enjoy shopping on mercari and I do not want this to be my last time I ever shop on there. Can someone please do something or let me speak to a higher up? I am not going to stop until I get Justice and someone to hear me out. I deserve a full refund, an apology and some sort of compensation for all the time and energy I have put into this.