I don't think bitsler is scam. you should pay the high fees for transaction if you want to complete your transaction quickly. Once my transaction was pending for 24 hours they return my actual amount and also pay me the bonus.
He did pay the high fee but he is telling that there should be an option for a more higher fee just so the transaction would be faster.
You shouldve just go to their support and complain there. Have you files a ticket just so they will see that there is some stucked transaction.
I am guessing this is a problem in the blockchain. Just try to use the services where they will push your transaction to be faster.