Apple store

hello, please help me to solve the problem I had no idea that Apple would give me so many inconveniences and nerves. I cannot pay for my purchases and subscriptions in the app store does not accept my cards. writes in red that the details are not correct and the time is not indicated correctly! although everything is correctly indicated! money in the account is everywhere. it will come up with a problem on purpose. everything worked well before. I bought a new phone 12 pro, it may have something to do with this. and for a week I signed out from my account and went into my mother's account and wanted to buy from a card that is connected to my account. the card was rejected at once. Maybe Apple thought that they were trying to pay 2 accounts with one card and because of this they blocked my payment systems. I am from Ukraine and there is no one to turn to. please adjust the functions to me as my 2 accounts