Answer: Go to the wallet from which the cryptocurrency was sent and cancel the transaction.
When too low a blockchain fee been sent, the transaction is probably processed late or not at all. Usually, the cryptos have not yet been sent and the process can be cancelled. If the transaction is cancelled, it can be resent with the correct fee amount. Did this not solve the problem? Please contact the wallet provider. Perhaps they can offer the solution.
If the cryptos are sent but do not arrive due to a lack of fee, it can take days or weeks, until the transaction is completed or sent back.
Quickly go to: