I am working in France as a consultant.
When recruited one year ago, my company could not afford to pay me the yearly salary I requested, but my boss offered to double the bonus I would get for bringing in new clients instead, as I was bringing one, which made my income close from what I was asking. Nothing about it was written.
I e-mailed my manager about this bonus 7 months later, as I had no information on when I would get it, specifying that the amount should be doubled as negociated with our boss. He confused it with another bonus and then played dead on this subject. Last week, after another e-mail, specifying once again the amount negotiated, he answered me by text message, saying that the bonus would finally be paid to me and that the amount would be X, X being the regular amount.
What should I do to get the amount I negotiated, should I get my boss involved now and what should I do if I don't get the amount negotiated ?
My boss, with whom I negotiated the bonus, is also my manager's boss, but for structural reasons I have almost no contact with him.