Update:I contacted Atomic Wallet Support and they gave me the solution as follows:
If you urgently need to access your funds, here is the instruction on how to import the mnemonic phrase from Atomic to Daedalus Wallet:
1) Download Daedalus wallet
https://daedaluswallet.io/#download2) Import your mnemonic. Here is the instruction on where to find the mnemonic
https://support.atomicwallet.io/article/19-how-to-view-your-private-keys-backup-phrase3) Send ADA from Daedalus.
I downloaded Daedalus wallet and imported my wallet via seed (not private key) and it really worked, but you need to start with synchronizing the wallet and you will download the entire ADA blockchain onto your device as this takes some time, after it finishes your ADA coins appear and then you can send them to an exchange Or another wallet.