Vinted complaint: I want my refund and an apology from Vinted

A seller had described the item as new but when it arrived it had two stains on and it smelled of washing powder so the item was not new in fact it had been washed.
I raised the issue with Vinted with minutes of it being delivered and took photos of the stains. As I mentioned in my complaint that the item was not new because it was washed, in the response from Vinted they said as I had washed it they have to release the funds to the seller.

I expressed to Vinted that if they had read my statement correctly instead of hastily assuming what my email was going to say have they would not have incorrectly paid the lying, scamming, misleading seller, who had agreed for me to return the item, when I challenged them on the stains.

Also I expressed to Vinted that the time of delivery and the picture taken as proof of the delivery at my front door , and the time I raised the issue was a few minutes apart.

How on earth could I have washed and dried this item and took pictures of it in such a short space of time? And why would I wash something that was described as new? Why would the seller agree to the return if they hadn’t already known about the stains.
I believe as Vinted incorrectly paid the seller they now do not want to accept the wrongdoings are we’re hoping I would go away and accept being ripped off. But I don’t think it’s right at all from the seller point but for a vinted to the pay the seller they deserve to be out of pocket. I am still willing to return the item as I will not wear some thing described as new but has stains that you can see on the front of the clothing.