erase iphone

Hello. I bought my phone in Montenegro on 03/03/2022 and now I can't unlock my iPhone. After the reboot, I forgot the password and entered it incorrectly many times. After that, I got the information "Erase device". I remember my Apple ID password and it is correct. And I read that if you insert a SIM card with the Internet, then I can "erase the device." But the phone does not want to connect to the Internet sim card, I tried three different workers from the sim card with the Internet. Neither Wi-Fi nor mobile Internet works as I understand it. After I enter the correct password, it just takes an infinitely long time to load and that's it. Therefore, this method does not work. I know that my password is correct, because after entering it, I receive an SMS code on my phone, so my password is correct.

Then I decided to restore access to the phone from iTunes. I installed ittones. But After trying to enter it with his login, he gives an error every time. I read on the Internet that this is probably because I had never logged into iTunes before and did not add a payment card there. I logged into my account using google chrome browser. And I tried to add my work card from the Bank of Montenegro, which works without problems with other Apple phones in my family. But when trying to add a bank card, it also throws an unknown error and does not add a bank card. So I can't unlock my phone with or without a computer. I put my phone in queue for erasing via iclouds. but he writes that the erasure will occur only after the phone is connected to the Internet. but this phone is completely blocked and it does not see either a SIM card with the Internet or Wi-Fi! Please help me. My phone was blocked it seems back in November. But I have a small child, and for all these manipulations I have no more than 10 minutes a day. I have not used my iPhone for three months already.​