The landscape of Web Scraping Providers is very varied. There are low cost and low quality providers but there are also many high cost but low service providers.
During your initial selection for vendors, some of these characteristics are hard to quantify, but as time goes on the reason for the low cost gets evident.
The lack of attention to detail and quality gets clearer.
The lack of service levels and responsiveness drops off after the hand-off from Sales to Service happens