The probe is related to the country's port sector.
Prepaid lines that are not registered by Thursday October 18 will be cut off.
The president of the country's financial consumer protection agency said complaints related to cyberfraud now outweigh those for all other forms of financial fraud.
A local daily reports that the Mexican unit of US banking giant Citigroup is planning major layoffs to adapt its workforce to a larger digital presence.
The central bank sees the open banking model as a way to boost competition, reports local daily Valor.
Polls continue to show the ultra-rightwing candidate enjoying a significant lead over leftist Fernando Haddad.