Hi, this has happened before to other people i remember, its an error from them. Just send them your biometric number and application number applicant name uding webform and if possible attach a snapshot of the gckey . Tell them you already done it last year.
They will relook at your file and will move on to the next step. Thats good news for you guys. Good luck
We have done that three times, When we did the medical we also re did the bio-metrics. I have paid for it 3 times now. I have emailed them with proofs yet we received instructions once again to do the Bio Metrics and the VAC is closed.