Peugeot Did Not Extend My 3008 Warranty For One Year As I Paid For

I paid ₺4458 via bank transfer to extend the warranty for my Peugeot 3008 at the Erdemir Peugeot Service Center in Haramidere, Avcılar, Istanbul, to extend the warranty by one year. During the process, I was told the warranty would be extended by one year, but I later learned it was only extended by mileage. The only reason I took my car to that service center was because it was the closest service I could tow since my car wouldn't start; otherwise, given my previous experiences, it's a service I would never want to go to. When I spoke with the dealership manager, I asked him if it made sense to extend the mileage limit to 60,000 for the last 20 days of the warranty, given that I'd driven 35,000 km in four years. He said it was perfectly reasonable. I believe I shouldn't even consider buying a car from a company that employs people with this approach, let alone consider it. I have documents such as receipts and invoices to rectify this situation. I contacted Peugeot customer service about the issue, and they told me an investigation has been launched. I request that the warranty be extended to one year, as promised at the time of sale. I request that my grievance be remedied.