So what I just lose 0.3 Bitcoins I spent with Nicehash to mine those coins?

? GREAT!!!!!!!!!
Missing payments where "only" for 12h of mining or so... + another 6h mining in the wrong chain. So lost about 18-20 h of mining power
Don't know how much time you rented.
So sry its all I can say

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It was coins mined from there 3 blocks.
4265, 4272 and 4290
Just saying sorry is not good enough. Especially when you made the mistake.
At least try to partially compensate or suggest something.
I am not the richest person in the world and just having thrown away over $100 because of a mistake you made is not fair.
Do something about it PLEASE.