I receive "this number tried to reach you" SMS, is it Saracroche?

These SMS do not come from Saracroche. When Saracroche blocks a call, the call is rejected and the caller is redirected to your voicemail: see Can blocked calls leave a voicemail?. If the caller leaves no message, your carrier's voicemail then sends a "this number tried to reach you" SMS. That is the SMS you receive, sent by your carrier and not by Saracroche.

Receiving this SMS does not mean the call rang: it was indeed blocked. To find where blocked calls appear, see Where can I find blocked calls and where do they appear?.

To stop receiving these SMS, disable the SMS notification for calls without a message by calling your carrier's voicemail.