My phone number was leaked by the property to some merchants to sell me goods. Is the property illegal? Can I sue them?

Suspected of illegally leaking or obtaining citizens' personal information "Any staff member of a state organ or financial, telecommunications, transportation, education, medical and other units who, in violation of state regulations, sells or illegally provides citizens' personal information obtained in the course of performing their duties or providing services to others, if the circumstances are serious, shall be sentenced to fixed-term imprisonment of not more than three years or criminal detention and shall also or shall only be fined.

Judging from your description, the circumstances are not serious, so he can't be investigated for criminal responsibility. It is suggested to call the police to impose administrative punishment in violation of the Law on Public Security Administration Punishment.