What if the customer refuses to accept the lawsuit after receiving the customer benefit fee for 3 years?

You can find mediation and find evidence to solve it.

1. Seeking mediation: Through the mediation of lawyers or relevant departments, both parties can be prompted to reconfirm and negotiate the contents of the agreement, so as to achieve the purpose of mutual benefit.

2. Find evidence: if there is relevant evidence about the agreement, such as email, SMS, contract, etc. You can bring a lawsuit to the court with evidence and let the court mediate or make a judgment.