donate bonus 10- 40 % !!!???

You say:

23 Dec 2016

donations for holiday bonuses is now live and will last until 12 Jan 2017! All donations now rewarded with a 10% to over 40% bonus coins!

Prior to that (20 Dec 2016) anyone that donated 100 euros was given 35 coins bonus.
How many coins today to receive € 100?

I've got 0 bonus !!!

You should have got a bonus over the 100 regular coins. All bonuses are displayed prior to making the purchase, in a sort of yellow color.