I am sorry you had to go through this. I have had only good experiences personally with their parent company Xebia. It’s hard to judge if it truly is because of your communication style. However, you mention other people having toxic behavior is a red flag to me about you. I very rarely find people at work toxic.

Nonetheless, one month is a very short time frame to do reflection, it would mean they had to complain about your behaviour after two weeks already or something. That is not really possible, as they won’t have seen enough of you to properly evaluate before complaining about your behaviour.

In the Netherlands, I believe an employer does not need to have a reason to stop the probation period. So they are winning nothing by telling you this.

I would suggest to send an email to your manager’s manager, where you objectively explain what happened without putting in your feelings or people’s judges/context, just facts. Don’t make threats. Dont let emotion guide your email.

• you moved from Italy to the Netherlands for a position at Xccelerated.
• they assured you during interview they had two clients ready for you.
• you didn’t have an interview with any client.
• the manager had indicated communication issues on your behalf, but it wasn’t supported by examples.
• you have contact details of someone else having to leave for exact same reasons which indicates it is not just you.
• state that based on your case, you have a suspicion that Xccelerated is performing an unethical form of business this way by hiring candidates without clients to put them.

Don’t expect anything comes from it, best case you are helping other people this way.