* I can see in my wallet that the btc is incomming but pending confirmations 0
What fee (in sat/vbyte) did they use?
* I then send the coins from wallet "A" to wallet "B" - its says your coins is now sent even tho transaction from tumbler to wallet "A" is at 0 confirm.
* money never arrive at wallet "B", obviously because the payment from tumbler is still at 0 confirmations to wallet "A"
Which wallet are you using? Electrum for instance would show the transaction, but I think you'd see "-1" confirmations to emphasize it has unconfirmed parents.
I can see the incomming payment in my wallet "A" history and the outgoing payment for wallet "B" but both have 0 confirmations.
Its now been 3 days.
Your next action depends on details of your current transaction: if your incoming transaction is small (in bytes) and doesn't have unconfirmed parents, you could use CPFP by sending a transaction with higher fee. That's easiest if your wallet A still has change.