China Mobile, China Telecom and China Unicom, have they ever made harassing sales calls to you?

All the same. They are all outsourcing business. No matter China Mobile or China Unicom Telecom, they harass the owners every day.

I suggest you download some mobile phone security guards and so on to see if there is an option to specifically block landline numbers. After all, most people who call landlines are selling them now.

In addition, go to the website of the Ministry of Industry and Information Technology to complain and leave more evidence for their future rectification. There are too many complaints, and they will be dealt with sooner or later. The problem is that few people know that they should go to the Ministry of Industry and Information Technology to complain, instead of calling 10086 or 100 10.

They make harassing phone calls just to promote products and earn your money. What's the use of complaining to customer service in other people's companies?

So if you want to complain, go to the Ministry of Industry and Information Technology for the record.