Carrefour Refused Refund for Defective Philips Power Bank and Charged Shipping

I purchased a Philips brand power bank from Carrefour. When the power bank was delivered, I opened it and discovered it wasn’t charging. I immediately contacted Carrefour customer service, reported that the product was defective, and requested a refund. A service ticket was created, and I was informed that my complaint would be evaluated by experts and that they might request photos of the product. A few days later, they asked for photos, which I provided, along with a video showing that the product wasn’t working. A week later, I was given a service address and told to ship the product there for inspection, after which I would receive a report confirming the defect. When I asked if I would need to pay for shipping, they said I wouldn’t. I sent the product to the given address, but later, customer service informed me that the product would be repaired or replaced. I stated that I did not want a repair or replacement for a product I had just bought and never used. They told me to call the service and request that no action be taken. I questioned why I had to deal with the service myself and why Carrefour wasn’t handling this directly, but they said they had no connection to the service. I explained that I could have delivered the product to a nearby Philips service center instead of shipping it. When I contacted the service, they implied that if I were dishonest, I could claim the product wasn’t repaired even if they sent it back unrepaired. I insisted I only wanted a report and that the product should not be repaired or replaced, and I communicated this to both the service and Carrefour. Despite this, the product was replaced without my knowledge or consent and sent back with shipping fees due, even though I had been told I wouldn’t have to pay. I had to pay ₺105 in shipping fees to retrieve the product. When I called Carrefour, they said the product had been replaced and would not be refunded. The product had been sent to the service upon their request, and as it was a defective product, it should have been refunded according to consumer protection laws. Carrefour, a supposedly large and reputable brand, has failed to stand behind a ₺600 defective product and has caused me significant inconvenience. I also requested a refund of the shipping fee, but this was denied. As a conscious consumer, I will pursue my rights through the consumer court, CİMER, and social media platforms to ensure this issue is resolved. I demand that my grievance be addressed immediately.