@bedanngugi difficulty with your off-brand phone is finding instructions on how to tear it down,.the charging port is soldered to a separate sub-board.
[image|1210313]
You would have to desolder it and replace it or replace subboard WBL7519 completely. The port is available at places [http://www.ebay.com/itm/5-X-New-Micro-USB-Charging-Sync-Port-BLU-VIVO-5R-V0090UU-LIFE-MAX-L0110UU-/132312862060|like this]