If the device is truly adding this stuff on its own, in front of your eyes, then you need to factory reset it immediately. This will clear any issues, or apps which are causing the problem, and allow you to re-install your apps one-by-one to pinpoint the problem.
If you know of an app that was recently installed when this started happening you can try uninstalling that app. My suggestion, factory reset (after backing up data) and go from there.
There should be no reason for the automatic phone dials unless the phone is in someones pocket, or other confined space, and dialing as a result.