Is this worth contesting?

I paid for 2200 grafts. Ive looked at it and would appear to be around 1650. Roughly 1250 front. 400 crown/mid. Thats 550 grafts ive been charged for, but most annoyingly they could have been used in the areas you can see need doing.

Is this even worth bringing up or am I wasting my time. U.K. based