Hello, here is around 6 days, I bought some bitcoin, after they sent them, I did not receive anything because the transactions remain unconfirmed for 1 week.
In addition, only one of the two appears in the blockchain, one of the two seems to be in another blockchain (mempool)
The mempool is not another blockchain.
Mempool is where
unconfirmed transactions wait to get included in a block. Until a transaction is included in a block, it is not in the blockchain.
When a transaction is included in a block it is considered confirmed.
I checked your transactions, and you are even overpaying fees according to blockstream

There might be something wrong with your transaction broadcast.
I used this tool from blockchair.com to broadcast your transaction again.
https://blockchair.com/broadcast But blockchair.com refuses to broadcast it. It shows a message that the transaction is being broadcasted, however I can't see it in its blockexplorer.
Can you tell us a bit more about this transaction?
Did you try to use RBF (Replace by fee) or something like that?? I don't know why blockchair would refuse to broadcast it.