Apologies that you were affected by this. The script creating these pull requests was created and run by a third party not affiliated with the company. We were similarly upset by this.
Are you saying you never hired the third party, they went about and did this of their own accord without talking to you first?
At the time we weren't actually making money yet, and most of the contributions to Travis CI came from outside collaborators.
To add to the confusion, we did indeed have a bot in the early days that would comment on pull requests, but only if the repository was using Travis CI already (this has now been replaced by GitHub's status API). However, this was not the same bot account that kept opening unsolicited pull requests on random projects.