InventureX Beyond Buzz Media I paid $2500 for a service and they failed to provide that service. Los Angeles California

I paid InventureX for a service I never got. After Joe Parker stopped returning my messages I contacted the Mark Campbell who said I could "cancel" the "partnership." He refused to offer me a full refund because there were "costs associated with my campaign."

When I requested evidence that the marketing team (Joe Parker and Jake Peters) did the work they claimed to do, no evidence was provided. Specifically, I requested the following but got no response on any of this: 

1. Copies of the emails the marketing team claims to have sent to folks on their backer list with the data for views and likes. 

2. A screen shot of the FB ads the marketing team claims were in the testing stages. 

3. A screenshot of the ads in the FB manager with date of launch and cost. 

4. Names and IG or FB account for the several influencers they have contacted who agreed to feature the product on their page. 

5. Copies of the messages the marketing team claims to have sent to these influencers.

To be clear, my Kickstarter campaign ended up over-funded and none of the backers were traced back to InventureX, so, clearly, my product and my campaign was not the issue. The issue was that InventureX dod not do the work they calaimed they did. If they did, they wold have provided evidence for that work.