vymaps has the wrong address for my client and it's ranking for their name

To find where the old address is still coming from, search the old street address in quotes along with the business name. Whatever turns up is what the scrapers are copying from. Old chamber of commerce pages, local news articles and forgotten directory listings are the usual culprits, and they're the ones to get corrected first.

Scraper directories like that don't really get corrected by hand. They copy from Google and the big data aggregators, so the old address is still out there somewhere upstream. Fix the sources first: Business Profile, Bing Places, Apple, Yelp, Facebook, and the main data aggregators in your country. The scrapers tend to update on their next pull. If they have a removal or contact address in the footer or privacy page, ask anyway, sometimes it works. The practical fix for it ranking on their name is to give Google better results: complete their own social profiles and the major directories so that page drops down.