Vehicle Griefing

I had an allied tank push my anti air vehicle around for 12 minutes straight from the beginning of the map.  Ally's name was Slinder.  Only option to report that felt adequate was "harassment" as I certainly felt harassed.  It really ruined my entire match.  Oddly enough he left and 10 minutes later I was fighting my way through an enemy controlled point and the game kicked me for "session timed out for inactivity".

I would love some feedback regarding this.  Very strange.