The gbox can be fixed. All you need to do is to replace the clutches and all the internal parts and may also need to change the torque converter.
Should not cost you more than RM2000 all in. I did my Perdana gbox (same as Wira 1.6) for only RM1300 at Soon Fong Gearbox Specialist Pandan Indah.
You can also try MScope Batu Caves but IMHO they are a bit expensive but they claim they use all original Mitsu or Japan parts.
Proton Wira 1.6 Auto Gear Box?, Best place/shop to get Wira Auto Geabox?