I am using Electrum 2.6.3 and the same default fees i was sending 15 days back and it gets confirmed but now it is pending. here is the transaction id which are still unconfirmed please help me in getting confirmed of this transaction.
b1e0cb4137874e08e188fa57582c40b4bd7edfbec325c258ed51907c3fb4ad29 - 0.003 + 15900
The default fees in older versions of Electrum are no longer applicable. You should upgrade to the latest version of Electrum so that you are always using the best fee and have more control over the fees too.
Please read
https://bitcointalk.org/index.php?topic=1802212.0 for what you can do about your transaction.