Vinted complaint: Lack of duty of care towards customers

Good afternoon, a few weeks ago, I purchased a child tracksuit from my son through Vinted.
The description of the tracksuit was “a very good condition with a sewn up rip” (please refer to the attachment for a more detailed description. When the tracksuit arrived, it appeared to be in unuseable condition as it’s been badly sewn up with further lines going sideways from where it’s been seen (it’s a stretchy material, so any movement would cause further rips). I asked to suspend the transaction, but Vinted support reviewed the case and concluded that the description of the item was accurate, hence released payment to the seller (nickname aarav321). They suggested to agree with the seller directly on a refund, which I did. The item was sent back to the seller and delivered. Moreover, the seller put it back on Vinted for sale. Needless to say, I didn’t get any refund and Vinted ignores my requests to raise a complaint towards them and investigate the scammer.
On a separate note, the company doesn’t have a formal complaints procedure in place and just ingores any requests to launch an investigation andor file a complaint