Trendyol Refund Rejected After Return Of Damaged Touché Items

I ordered from Trendyol (Touché brand) on October 2 and issued a return on October 3 for three items, one of which was damaged. The return was shipped on October 4, and I received the delivery confirmation on October 7. However, I only received a refund for one item, and the refunds for the other two were rejected because they claimed the products were not received. I contacted Trendyol customer support via chat, as there’s no phone number, and they told me to reach out to the shipping company. The shipping company provided proof of delivery, and Trendyol then confirmed the return was received but said, “We can’t do anything about it. You should contact the brand, Touché Privé.” For a month now, I’ve been in contact with Touché Privé, who keep saying, “We created a ticket and are following up.” Just yesterday, they told me it’s not on their end and that it’s Trendyol’s responsibility. I’ve been a Trendyol customer for five years, and I didn’t choose to trust the operations of the shipping company or the brand. Why am I being asked to investigate when I’m Trendyol’s customer? Isn’t Trendyol responsible since they work with these partners? I trusted Trendyol because their page guarantees deliveries, returns, and refunds for damaged items. Where is the customer support now? I’m extremely frustrated and considering opening a case, as what’s happening makes no sense. I simply want my money or my items back—that’s my basic right.