Can Bootloader be UNLOCKED twice?

So I unlocked the bootloader of my MOTO G2 and successfully installed custom ROMs but I wiped all data using the TWRP recovery and that wiped off the OS from my phone too, leading to a bricked device. There was no OS on my phone and no SD card support so I couldn't copy a ROM over to the phone. I tried the ADB method but it didn't work, I think because the drivers don't support Windows 10. I tried everything but no luck so I gave my phone to a local service shop and they fixed it but locked my bootloader. Is it possible to unlock the bootloader twice using the same method, that is, by acquiring the unique unlock code for Moto G2 from Motorola site OR using the unique code that I got earlier? I am curious to know because I cannot find it out myself until I retrieve my phone.

Thank you so much guys.