Hopefully this will help:
Go to Fiverr.com\support and click submit a ticket in the upper right hand corner.
Choose Trust and Safety in the request type dropdown box.
For subject, perhaps “scam gigs” and in the description (be professional and polite) give a brief explanation and you can include a list of gig links if you have them. I wouldn’t report more than 10 at once and give it a month to report more. Fiverr does not have a huge staff.
Under ticket categories choose reporting questionable gigs.
The other fields should be self-explanatory. I use this method myself and if Fiverr can find enough backing to satisfy their requirements, they will take some kind of action.
They can’t tell you what they decide for privacy reason, but I can verify that they try (slowly) to work on reported gigs. It will usually take them anywhere from 10 - 30 days for this type of report. These usually take longer as scam investigations are tough and there are usually multiple gigs or sellers involved. Good luck and thanks for helping as you see fit.