I located the distributor for KULALA brand here and visited their office and they reflashed with stock rom and its working normal now.
I will try to up the system dump or if anyone can guide how i should make a copy of that stock rom so it could help anyone else to use as well. Last time did copy of a stock rom was via adb using MTKDroid Tools and chose the backup option and it made a folder in mtkdroid tools folder of it. If thats how its done ill make a copy and post here.
Thanks for the help.