complaint, compliant

Complaint or complaint ( comm plaint ) means an expression of dissatisfaction or discontent--
He always seems to have a complaint, no matter how good the food is.
She was angry because no one would listen to her complaint.

Compliant or compliant ( comm ply ant ) means in accord with rules, requirements, wishes or demands--
This web site is compliant with all of the regulations.
He is usually compliant, and will go along with what anyone else wants.

Now that you know that, you can say--
"We got a complaint that we are not compliant with the latest regulations."

Note--"complaint" is a noun ( thing or idea ). The plural ( more than one ) of "complaint" is "complaints"--
He has several complaints. Which do you want to hear first?
"Complain" is a verb ( action word )--
I complain, you complain, he complains, we complain, everyone is complaining. Yesterday we complained.
Note # 2--"complainant" means a person who voices an objection of dissatisfaction or discontent--who complains--
Will the complainant please step forward?
Note# 3--"comply" is a verb ( action word ), meaning to go along with the rules or requirements, or with someone's wishes or demands----
I comply, you comply, he complies, we all comply. Yesterday we complied. We are complying.
Note # 4--"compliance" means a state of being in accord with requirements or rules, wishes or demands--
Unless the board sees evidence of compliance with the regulations, we will be fined.