This may seem alot of text but I took big screenshots just in case, but the important is highlighted.
We agreed on 245 (he later paid 250, no big difference) and that would include the bot and 3 that later changed to 2 then later to none.
He said he didn't want to pay for maintenance, only as extras.
https://i.imgur.com/5AbQdRT.png
We agreed on Bot and 2 bumpers
https://i.imgur.com/XqkrC6z.png
He said he didn't need more bumpers.
https://i.imgur.com/ePluUQy.png
He didn't pay more than we agreed, (I mean, he said 250eur and I said yes, both of us forgot it was 245, but I don't think 5€ is a big difference).
https://i.imgur.com/AuRw0o2.png
TL;DR
We agreed on 250Eur for the bot + 2 bumpers that later he said he didn't want them. He also said he didn't want to pay for maintenance because he said there was no guarantee.
This was our agreement.