Last episode about my last stay there a few days ago...
We were late for the airport so we did not spend much time during checkout to confirm the amount on the invoice and I was not asked to sign or confirm anything)

Just realized that there were 2 mistakes :
- Breakfast for the first night not deducted on the invoice while it was confirmed by GM assistant
- Breakfast invoiced (93,21 $) for the 2nd night while it's offered as a Diamond member

Just sent them back an email to get explanations. I'm pissed and feel they just tried thinking I would not notice (which I did not before looking at it in details).
I will definitely look at other options in the future