No power after 4 hours on a new battery

Using Macbook Air Retina 13 inch 2020. 8GB 3733 MHz LPDDr4x Sequoia 15.7.1

I just had a new Battery put in. I have been on the internet on social media and you tube this am for about 4 hours and I am out of power now. I was fully charged 100% when I started. I was told I would get from 8-10 hours before charging again. Is there a chance they didn't put a new battery in , but an older one? They sent it off so I have no way to prove they did. I cannot get it to down load updates either. It stops and the 30 min left part.