of - against - about - from - to

1. She has a bitter complaint her colleague. 
2. You should voice your complaint our manager. 
3. I can hear complaints the passengers as they exit. 
4. Locals have submitted their complaints the pollution. 
5. Serious complaints discrimination have arisen. 

have - respond - formal - customer - common

1. Our staff will reach out to to your complaint. 
2. I believe you a complaint about the arrangement. 
3. The brand needs to find a new way to handle complaints. 
4. He upholds a complaint against the institution. 
5. Poor infrastructure is a complaint about the apartment complex.