What if the colleague next door maliciously writes the slogan of the old shop?

1. Investigate the facts: First, find out whether this colleague really has many years of history. If the advertising content is inconsistent with the facts, relevant evidence can be collected for follow-up action.

2. Communicate with each other: Try to communicate with each other, explain your dissatisfaction to them and ask them to stop using misleading slogans. If the other party is willing to cooperate, this problem may be properly solved.

3. Complain to the relevant departments: If the other party is unwilling to cooperate, it can complain to the local administrative department for industry and commerce, the market supervision administration and other relevant departments. They will investigate this situation and take corresponding measures.

4. Seek legal aid: If the complaint fails to solve the problem, you can seek legal aid and bring a lawsuit to the court to safeguard your legitimate rights and interests.