I can’t use cellular

Hello dear apple family, I am Burak, I live in Istanbul Turkey. I am a customer who has an apple ecosystem at home and I continue to use it with pleasure. During my last visit to New York, I wanted to add the apple watch to my apple ecosystem and bought it. We chatted a lot with a sales consultant friend. I told them all that I came from Turkey and lived in Istanbul. He was even originally Spanish. I don't remember the name. The gentleman gave me a cellular watch that only works in the Americas region. When I checked your website, I understood what the problem was. My watch model is Series 8 A2774 (45mm). As you know, the European model is the A2775. I would be very happy if you help me. As a technology lover, I am very victimized in this regard. I want to use my watch with all its features. Thank you.