Which debt collection company in Guangzhou is legal and formal?

There seems to be nothing legal or illegal about debt collection companies. Look at the reputation of the company you are looking for, and don't pay attention to efficiency. I also have a debt from millions of years ago, and that person has been dragging his feet and never implementing it. This is really a headache. Later, he had to find a debt collection company. In fact, debt collection companies are on the edge of the law as long as they are not illegal. The agreement of their company is also very secure for creditors. The company's name is Guangzhou ASEAN Business Service Co., Ltd. You can find their phone number by entering ASEAN debt collection company in Baidu. It seems that they answered all the business in the country.