Lumia 435 unlock error and credit gone

Lumia 435 unlock error and credit gone, cannot try again

Connecting to server...
Connected
Authenticating...
Authenticated
Checking Client version...
Client version is valid
Processing Step #1
Processing Step #2
Processing Step #3

user: pigli0020

this service most of time, always get error and very hard to get support
chat on skype, no one reply me