The Black Exchange has ceased operations CUSTOMER SERVICE Mustan Pörssi's customer service is closed. If necessary, you can contact K-Citymarket's warranty service. Customer service is open on weekdays from 9 am to 4 pm. Closed on public holidays. K-Citymarket's customer service is available by phone 0106 2004 * or by e-mail takuuhuolto@citymarket.fi. WARRANTY AND SERVICE For warranty and service issues, contact an authorized service center in your area as a matter of priority . Service centers can usually be found in the operating instructions supplied with the product or on the manufacturer's website. If necessary, you can contact K-Citymarket's warranty service tel. 0106 2004 * or by e-mail takuuhuolto@citymarket.fi. Click and see the K-Group's online services here » * Call charges: numbers starting with 0106 when calling from a landline 0.088EUR / min (incl. VAT) Numbers starting with 0106 when calling from a mobile phone 0.088EUR / min (incl. VAT) When calling from abroad, the price is determined according to the price list of the local operator.