You’ll have to contactsupport, they’ll get you shipping labels to send it to the Cordon, the repair contractor. Will cost you 30€.
Once you get your phone back, don’t ever lock the bootloader without checking fastboot flashing get_unlock_ability beforehand.
And in the case of CalyxOS, don’t lock it manually the next time, the device-flasher checks for that and prevents you from bricking.