Samsung A34 5G fingerprint login fault

I would love to share my frustration. I've upgrade last week to a Samsung A34 5G. I've had a fingerprint log in on my new phone, the option just disappeared, i could not log in to my phone, a security code was needed which i didn't know since it did not accepted my pin. I had to go into Vodacom, my phone needed to be swiped, i had to pay R150 and it took an hour and a half of my time for something i did not go as fault. The biggest frustration was the week before i had to pay R100 to transfer all my info on previous phone to new phone, also took almost 2 hours at the Vodashop, then everything was wiped off again and the i had to go in again to the vodashop to transfer info on old phone back to new phone for the second time, luckily i didn't sell my old phone as yet. It was highly frustrating since i had to do all the work again regarding locking into all app's and verify pin again. The guy at the Vodashop could not tell me why the fingerprint log in just disappeared