Have you tried to reflash the phone and make a factory reset? Was the phone connected directly to the computer, without any adapters?
Also, please try to reinstall ADB drivers first.
If the phone could not be unlocked, to find the solution, you need to provide the log file (as you already did) and the name of your credit account.
Then make a video with the unlock procedure in high-quality (HD). The video should clearly show the phone's IMEI number, phone model, how it was locked and unlock procedure, during which received unlock can be viewed. Upload video to a file-sharing platform or YouTube and specify the link here.
The team will review the unlock video and make a decision. You will either get your credits back or get advice about the problem and how to solve it.