There is A solution
these files use attributes to be unremovable .
if you try: lsattr /system/app/providerdown.apk
the result will show that the file have "I":as Immutable(that means you can't modify or remove)
and "a" :Append only ;
so to remove these files you have to:
1/ be root : su
2/ remove attributes # chattr -I -a /system/app/providerdown.apk&&rm /system/app/providerdown.apk