Asus x670 e Hero Motherboard C5 Error

ServisPoint is sabotaging people's efforts (Asus turns a blind eye!). They damaged the product I sent and refused to assist. The product is an x670 e Hero Asus motherboard. I requested the replacement of only 3 parts for a fee. I sent the product to the service center about 6 months ago, around November 10, 2023. I waited 3.5 to 4 months for parts to arrive from abroad for replacement. After the parts were installed, the motherboard started showing a C5 error, and the RAM slots became non-functional. Some RAM slots wouldn't produce an image at all. They filled the RAM slots and the motherboard with Flex and paste. When I contacted them for a second service form, they refused to accept the request. I reached out to Asus, and they instructed me to send the product to them again for technical service. Although I requested a product exchange, they attempted to fix the shoddy workmanship and send back the damaged main card. I've been waiting for this main card for about 6 months. Despite requesting a replacement, they claim they can't provide one without an invoice. They agreed to provide a DOA (Dead on Arrival) report but refused to send a new product due to lack of an invoice. They are unresponsive regarding the report's use. Asus' authorized personnel are not adhering to Asus' working principles. This product is from Asus' own stock in Turkey, with guaranteed warranty service by Asus Turkey's technical team. Instead of replacing the damaged main card, they insisted I accept it because I lack an invoice. Six months is a substantial period. I didn't steal this motherboard; I purchased it. It was sent to YouTubers for review. Even if I received the product for free, it doesn't justify ruining it. Your technical service, responsible for the damage, must replace the product. Asus Turkey, you're obligated to protect my product. Your technical service's incompetence isn't my problem. What gives you the right to abandon me over a missing bill?