Sichuan Chengdao Law Firm was established at 20 1 1,1,with its registered address at1floor, Shunji Building, No.252 Shuncheng Street, Chengdu, and its legal representative is Xue Jia. Business scope includes legal services. So sending a lawyer's letter is true.
But it can't prove that you have been sued, and the lawyer's letter may be used as evidence that you have been told.