The solution to the problem of no sale if the amount of trademark infringement is less than 500 yuan is as follows:

1. Find the industrial and commercial administration department for mediation. In the dispute over the amount of compensation for infringement of the exclusive right to use a trademark, the parties may request for mediation. The industrial and commercial administration department handles the mediation.

2. If you file a lawsuit in court through mediation by the industrial and commercial administration department, if the parties fail to reach an agreement or do not perform the mediation letter after it takes effect, the parties may also file a lawsuit in the People's Court.