I recently transferred 0.29454 mBTC to my Electrum Wallet.  I used the address given me.  The service i used to send the coin states the transaction is complete.  On the Electrum side, under the Receive tab it is stuck on pending and has been for 24 hours.  The addresses match perfectly.  Under history there is no sign of the transaction anywhere.  Where can it be and what can i do?