Altice finally went up; so I decided to sell my ATUS and close my options.
For ATUS I get the following result, based on original value of shares: €27,240.69 – €19,433.10 = €7,807.59
With this I already recoup my loss due to taxes.
I will still have to sell MY ATC shares and hope to win at least €5K in total.
I will still have to file a complain to get back the taxes I paid.