Hi I took a I phone ...

Hi I took a I phone 8 Apple December 2024 it gave me problems last year June I took it back eversince they never fixed i must call and send messages after them they can't give me an answer its been 7 months im paying for a phone I don't have no one can answer me and they said they can't give me a other phone so now I don't know what to do im paying a phone I don't have and how long is it still going on like this thank you....