Hey United, who is best to call about a complaint. I purchased a flight for my annivers...

Hey United, who is best to call about a complaint. I purchased a flight for my anniversary and it was changed without any form of notification. I was supposed to be arriving at *, now I have an extra layover and will be there at *:**.. missing dinner reservations and non refundable concert tickets. Please let me know who to contact.**My confirmation number was: B*LG*V**My United Mileageplus is: PZA*******Initial flight schedule:*TYS-DEN ***** (*:** - **:**)**DEN-SBA * **** (**:** - *:**)**New schedule without notification (not even the front desk told me...)**TYS-DEN ***** (*:** - **:**)*DEN-SFO **** (*:**-*:**)*SFO-SBA ***** (*:**-*:**)***Again, I was never notified by anyone of this change, and it has added * hours of travel time, an extra flight, and ruined my scheduled plans. Please Get back to me about some for of compensation whether it be miles, or meal vouches etc as I'm going to be spending much more time traveling that I was told. Thank you for your time.