I will make that phone call for you, or on your behalf. Please know that it has to be something serious and not a defamatory or insulting phone call.
This is more about a confrontation with someone, or speaking to a company about your concerns, or telling something to someone (not abusive or foul language) that you need to get off your chest. I will do that for you.
You must let me know the desired outcome of the conversation and exactly what you'd like me to say to this person.
Your satisfaction is number one to me.