Backlinks From Edu Sites

Hello,

I hired someone to build backlinks for my blog on 6 educational authoritative sites ( like Harvard, Stanford, Washington, and Columbia) about 2-3 months ago. The thing is just one of those links showed on my backlink profile on Search Console and none of them appeared on Ahrefs, Moz, semrush, etc… I found out surprisingly that they are not indexed yet, I don’t know why! So I started tire 2 backlinks and shared them on social media platforms but still nothing! What I know is that articles on authoritative sites indexed super quickly but unfortunately, this didn’t happen here! Could someone tell what to do! I want them to be indexed as ASAP to improve my rankings…