Is it illegal to call the company to harass?

If the other party calls your work unit to harass without your permission, it is violent collection. You can complain. In order to solve the problem as soon as possible, I suggest that you ask your work unit to call the police in the name of the unit.

Legal basis: Civil Code of People's Republic of China (PRC).

Article 103 Unless otherwise provided by law or expressly agreed by the obligee, no organization or individual may commit the following acts:

(a) by telephone, SMS, instant messaging tools, e-mail, leaflets, etc. Disturb the private life of others;

(2) Entering, taking photos or peeping into other people's private spaces such as houses and hotel rooms;

(3) Shooting, peeping, eavesdropping or revealing other people's private activities;

(4) Shooting or peeping at the private parts of others' bodies;

(5) handling other people's private information;

(6) Infringe upon the privacy of others in other ways.