1. Whether the dunning company is legal or not depends on the situation. Details are as follows:

(1) The dunning company is legally established in accordance with national laws;

(2) When the dunning company collects debts, it shall abide by the provisions of relevant national laws and regulations, and shall not collect debts by violence.

2. Legal basis: Article 171st of the Civil Law of People's Republic of China (PRC).

If the actor has no power of agency, exceeds his power of agency or terminates his power of agency, he will still carry out the agency act, and it will have no effect on the principal without ratification by the principal.

The counterpart may urge the principal to ratify it within 30 days from the date of receiving the notice. If the trustor fails to declare it, it shall be deemed as refusal to ratify it. Before the act committed by the actor is ratified, the bona fide counterpart has the right to revoke it. Revocation shall be made by notice.

If the act committed by the actor is not ratified, the bona fide counterpart has the right to demand the actor to perform the debt or demand the actor to compensate for the damage he has suffered. However, the scope of compensation shall not exceed the benefits that the counterpart can obtain when the principal ratifies.

If the counterpart knows or should know that the actor has no right to act as an agent, the counterpart and the actor shall bear the responsibility according to their respective faults.

Second, what are the conditions for legal debt collection?

The conditions for legal debt collection are as follows:

1, there must be evidence to prove the existence of debt relationship. IOUs, transaction contracts, bills of lading, receipts, bank records, audio-visual materials, etc. Can be used as evidence to prove the existence of debt relationship;

2. Have the minimum information of the debtor. At present, the separation and merger between companies are very common, and many companies change their names and residences by the opportunity of separation and merger, so that creditors can't find them, thus avoiding debts;

3. There must be enforceable clues about the debtor's property interests;

4. Pay attention to the provisions of the statute of limitations, and make and save the evidence of the interruption of the statute of limitations.