We work with viabtc and our method is guaranteed to work. Other accelerators are not 100% working . Actually we don't accelerate, we confirm it by putting in the latest block coming block . We even refund customers after 24 hours but it won't happen ( not confirming in 24 hours )
You can check our telegram group for people's review. And our charges are less than anyone . So you will have a confident payment .
This transaction was confirmed yesterday in 2 hrs .
https://blockchain.info/tx/90017ec16959c81aad659b90e9cbe141d731d773e8f853759fbb48045f566935