当面投诉或写信投诉通常更有效。

Complaining in person or by letter is generally more effective.

youdao

对于客户的投诉，提供专业及有效的协助。

For customers' complaint, provide professional and effective assistance to customers.

youdao

对于客户的投诉，提供专业及有效的协助。

For customers' complaint, provide professional and effective assistance to customers.

youdao