J810y unlock fail ,lost 10 credits.

I UNLOCK 3 TIMES .ALL FAILED .ON SECONDS TIME LOST 10 CREDITS .
AND I AM AFRAID WILL LOST SOME MORE CREDITS .BECAUSE BEFORE HAPPEN SAME PROBLEM .WHEN I CONTACT SALE@Z3X-TEAM.COM
THEY ONLY REFOUND 5 CREDITS TO MY ACCOUNT .EVEN SOME FONE I SPEND 10 CREDITS .HE ONLY REFOUND 5 CREDITS AFTER 3-5 DAYS REPLAY MY EMAIL .ONCE EVEN ASK VIDEO RECORD AFTER 2 WEEKS ,I SEND MY REPORT TO HE . I BEEN USE Z3X FOR 8 YEARS .EVERYWEEK I SPEND MORE 2*50 CREDITS ON Z3X .Z3X'S TECHLOGY IS BEST .BUT NOW FOR CUSTOMER SERVICE NEED IMPROVE. SORRY FOR MY BAD ENGLISH .
MY CREDITS ACCOUNT IS : zsc_c8tMmKrk
HERE IS LOG

Checking Login and Password... OK
Ballance: 40 crd.
You have 40 credit(s) left. This operation takes 10 credits.Continue? Yes
Waiting ADB device... OK
Reading phone info...
Model: SM-J810Y
Android version: 8.0.0
PDA version: J810YDXU2ASC5
CSC version: J810YVFJ2ASC5
Phone version: J810YDXU2ASC5
Product code: SM-J810YZKAVFJ
CSC country code: Fiji
CSC sales code: VFJ
Phone SN: R58M11S446E
IMEI: 359202090175752
HW version: MP 0.500
RF cal date: 2019.01.10
Chip name: SDM450
Modem board: SDM450
Security patch: 2019-02-01
Boot Warranty bit: 0
SIM State: NETWORK_LOCKED
Initialization zTool... OK
Running zTool, please wait... OK
Reading data from phone... OK
Searching Ramdump interface... COM40 detected
Reading data from phone... OK
Calculating... OK
Searching server... error
could not connect to server

Operation: Read Codes via Server
Selected model: SM-J810Y
Selected port: COM62 SAMSUNG Mobile USB Serial Port
Software version: 36.1

Checking Login and Password... OK
Ballance: 40 crd.
You have 40 credit(s) left. This operation takes 10 credits.Continue? Yes
Waiting ADB device... OK
Reading phone info...
Model: SM-J810Y
Android version: 8.0.0
PDA version: J810YDXU2ASC5
CSC version: J810YVFJ2ASC5
Phone version: J810YDXU2ASC5
Product code: SM-J810YZKAVFJ
CSC country code: Fiji
CSC sales code: VFJ
Phone SN: R58M11S446E
IMEI: 359202090175752
HW version: MP 0.500
RF cal date: 2019.01.10
Chip name: SDM450
Modem board: SDM450
Security patch: 2019-02-01
Boot Warranty bit: 0
SIM State: NETWORK_LOCKED
Initialization zTool... OK
Running zTool, please wait... OK
Reading data from phone... OK
Searching Ramdump interface... COM40 detected
Reading data from phone... OK
Calculating... OK
Searching server... error
could not connect to server

Operation: Read Codes via Server
Selected model: SM-J810Y
Selected port: COM62 SAMSUNG Mobile USB Serial Port
Software version: 36.1

Checking Login and Password... OK
Ballance: 30 crd.
You have 30 credit(s) left. This operation takes 10 credits.Continue? Yes
Waiting ADB device... OK
Reading phone info...
Model: SM-J810Y
Android version: 8.0.0
PDA version: J810YDXU2ASC5
CSC version: J810YVFJ2ASC5
Phone version: J810YDXU2ASC5
Product code: SM-J810YZKAVFJ
CSC country code: Fiji
CSC sales code: VFJ
Phone SN: R58M11S446E
IMEI: 359202090175752
HW version: MP 0.500
RF cal date: 2019.01.10
Chip name: SDM450
Modem board: SDM450
Security patch: 2019-02-01
Boot Warranty bit: 0
SIM State: NETWORK_LOCKED
Initialization zTool... OK
Running zTool, please wait... OK
Reading data from phone... OK
Searching Ramdump interface... COM40 detected
Reading data from phone... OK
Calculating... OK
Searching server... error
could not connect to server

Operation: Read Codes via Server
Selected model: SM-J810Y
Selected port: COM62 SAMSUNG Mobile USB Serial Port
Software version: 36.1

Checking Login and Password... OK
Ballance: 30 crd.
You have 30 credit(s) left. This operation takes 10 credits.Continue? No