1. transaction id: b55a68e7f9a4f336469068d9dacf4457aa0f72e2db4605dd2aedf87456d50b24
2. sender/receiver: sender
3. addresses: 1NHwR3ey59QM2TZdC3MJcge4GvYu9wBWRN is my address(I am using Bither HD wallet, the address always change), 1M5GFFNdDq3HznQaDGV99Vh6GGXfopC7df is the receiver's address( this is also my address,but controlled by Bitpie wallet, because i don't have the private key)
wallet software: Bither Hot 1.7.7  on iOS
mempool: yes, i have checked http://www.mocacinno.com/page/getraw, entered my transaction id, and i was shown the raw transaction, so this transaction is in your mempool
something strange: yes, I have contacted Bither's support team, they only ask me to use Bitpie accelerating function which costs thousands of USD.
rectified situation: No, the wallet doesn't have a dynamic fees function
tip: yes, I use my Bither HD wallet( my address change to 14KRVcjFD5MD5pdw6t94VXxQ2Hfdgx46Ls recently, can't find this address on blockchain.info) to send 0.00271635BTC, but I cannot found the transaction id, please help!

Maybe Bither wallet is scam?
I still have other unconfirmed transactions id:
(1) 20f341efceae193b7eb79e6c990735a4b7659d41536c1dc187324ccf40a53ea4
(2) d8b5b81a6295c4ba2291549096bbd0b0c7aafa2cca833e6506f701fdf39160ca
(3) c7b475c3e3284af39aebe3172a3d1d21daada8aa708c6d802310a165ab8b39d4
(4) b55a68e7f9a4f336469068d9dacf4457aa0f72e2db4605dd2aedf87456d50b24

I have no idea what's happening and what should I do, please help!!
Thanks for your concern.