nightmare support

I purchase a dell XPS 15 (9550) and within 2 months noticed my battery was dying.  I now can only use a fully charged battery for less than 2 hours after charging.  Called support and was transferred 4 times before getting the right professional tech support team.  Guy I had did not seem to know much and was not able to answer basic questions.  I had him transfer me to the supervisor who answered some questions and then transferred me back to the original tech..  I spent over a hour being transferred to ultimately have them require me to download a microsoft diagnostics application which may or may not evaluate the battery to tell me if it was bad.  I know the battery is bad because I use it every day for only 2 hours max with no new programs added to the computer other than word processing.  All I need is a new battery and cannot take another hour out of my day to get this serviced.  I would return the computer for a refund but the refund expires after 30 days.  I am so upset right now.