It is the situation that occurred last night.
I was sent token for the DunkPay Token event.
I sent a transaction with 9Gwei fee for saving the transaction fee.
I was waiting for half a day, but it was would continue to be re-pending.
The bigger problem was that EOS ICO, which was trying to join, was coming.
I rushed to find a way to cancel pending transactions on the Internet.
https://jakubstefanski.com/post/2017/10/ethereum-cancel-pending-transaction/
It is a way to set the order (nonce) of a pending transaction and resend it. The solution is explained only in the documentation, which seems to be complicated for the ordinary people.
So I created a app that Cancel Your Pending Transaction (CYPD).
First, remember the order value (Nonce) of the pending transaction.
Go to https://www.dunkpay.com/CYPD/ETH and just enter the nonce value.
(I would appreciate it if you give me a tip)
It is important to note that you must set the gas fee of transaction higher than the pending transaction.
I set the gas rate above the average for the new transaction and It was immediately assigned as a new block.
Previous pending transactions are no longer in existence due to defeat in gas competition.
I will go buy EOS right now.
If this solution is not solving for your problem , please let me know though send message.