To exchange ETH to Tinkoff RUB, you need to follow several steps:
Make an application, indicating the amount of eth for exchange, Tinkoff card number, account number, phone number and e-mail.
Payment is made from Tinkoff cards.
Read the terms of the agreement for the provision of exchange services, if you accept them, put a tick in the appropriate field. And create an application.
After sending ETH, wait for 12 network confirmation.
Use ETHEREUM (ERC20). When paying from another network, the payment is lost.