<human>: At the end of Summer, my employer asked about the logistics behind constructing a bouldering wall (long instead of tall) for his gymnasium. He asked for a proposal with quotes from local companies, as well as a quote to do the project in-house. The cheapest quote was $40 per square foot (600 sq. ft. total). I calculated cost of materials and gave an estimate of $2,300 not including labor. He hired me, and we agreed from the start that anything less than $500 would not be fair. I began planning, and was told that he was bringing in somebody else to help... and that he would also be paying him, so it wouldn't be as much as he would like. I was a bit disappointed, but seeing as to how I'm in college, any money is better than none. Fast forward to this week, and the wall is completed with extra features we didn't originally discuss, a high quality custom texturing, hold and route placement, and crash pads placed (not to mention all of the cleanup). Yesterday, he called and told me he was hoping to get at least $300, and asked if that was alright. I told him that I had expected more, and that we had originally said he would try and get at least $500. What he said next appalled me- he said that he meant for us (the other worker and myself) to split. Seriously? $150 for us? And no consideration of the fact that the planning, execution, etc. took well in excess of 70 hours? What do I do? He asked me to come by his office today and I'm afraid he's going to hand me a check for a similar amount, and I won't be able to do anything. He's a good friend, but geez, this isn't right...

Summarize the given text in a few sentences.
<bot>: Built 600 sq. ft. climbing wall for boss, agreed on no less than $500, and am instead being offered a little more than $300 split between myself and an assistant. What do I say?