If your transaction has not yet been confirmed, try this site for free Transaction Accelerator
http://perenosi.com/ We aggregate Bitcoin transactions (inc. Zero-fee) into pool of transactions to force pushing via service ViaBTC and increase probability to get all confirmed. Please submit your TXID once per hour, otherwise your transaction can be banned and removed from the pool.
* The service charges no fee for the operation.
Next time before sending bitcoin, see if the network is overloaded here
https://bitaps.com or here
https://btc.com/stats/unconfirmed-txthis can help avoid payment delays