The short answer is, yes - you can contact your service providers directly.
With that being said, studies have shown that it generally takes an average person at least 30 minutes to negotiate a single bill on their own. It can also take additional legwork to know if you’re getting the best rates and current promotions.
This means that having several bills might take you upwards of hours to negotiate.
Billshark has had enough experience to know what rates you should be getting from your providers, and what negotiation tactics to use. It takes you just 2 minutes to get started, and Billshark will do the rest of the work for you.