I can guarantee you that all the gigs that claims on first page of Google are clear scams. I have tried several gigs and no results at all!
If you are getting some results this is due to your previous seo or quality of your articles…etc. Don’t think these sellers can bring you any good result! All of these scam artists use bots to generate bulk links. Don’t be fool to believe that they will build hundreds of manual links for 5$ or even for 50$. All are bot generated links!
Since they claim the results come at least after 1-2 months, According to Fiverr rules you are not able to claim a refund either! or at least Fiverr will not allow you to post a negative review after 30 days!
If you search the gigs for the term ‘seo’ you can find these gigs among top results!