I specifically emailed them and told them NOT TO CANCEL MY MOST RECENT TRANSACTION.
YOU know what they did?! they cancelled it anyway just to make a profit.
Don't do business with them, they're a bunch of crooks.
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I am having the same problem, I have tried to transfer a small amount of coins from my coinbase wallet, the transaction remains in pending condition for upto 24 hrs and after that they cancel the transaction and transfer the funds back in my account.
I have written to support and they said I have some problem with my account and they asked me to make another account on coinbase and let them know it and they will transfer my funds their. I am going to do that today and see how it goes.