When I inserted my smartcard into the new cüzdanmatik machines, it does not confirm my password and I receive a message stating "Teknik nedenlerden ötürü şu anda hizmet veremiyoruz. Lütfen daha sonra tekrar deneyiniz."
You receive this message because the ATM card or credit card that you use in account linking has been renewed by the bank due to various reasons (broken, stolen etc.). To avoid this problem, you need to remove the account linking between your card and your smartcard before you apply for a new card.
If you encounter this problem, you need to apply to METU branch of İşBank and fill up the petition form. The account linking process of your new card would be completed in 10 days.