Struggling to Find Canon MF237w Printer Service in Istanbul

I urgently require service for my Canon MF237w printer, but I'm unable to locate or reach the authorized service center in Istanbul, Turkey. The supposed appointed service, Teknoser, fails to provide any information on their services and cannot be contacted through their website's application form, which consistently generates error messages. The internet is flooded with complaints about Canon's service. I used to view Canon as a reputable company that stands behind its products, but it appears I was mistaken.