I think I'm being scammed by a debt collector- what should I do?

I started getting phone calls from this company, GC services, about a week ago, saying they want to collect a debt. I’m 100% positive that I don’t have any debts right now. I checked my credit report and it showed that I have a debt of $800 with this company for a past-due bill with Sprint, a company that I have never used. I disputed this with all three credit bureaus and they removed it.

The company uses a few different numbers to call, and today they said they were looking for my aunt. We have the same first name but different last names, and we live at the same address. I’m worried that my aunt’s credit will be affected. I want to have a plan when I tell her about this, to reassure her and calm her down.

I googled the company and about a million results came up saying that they were scamming people and collecting debts that don’t exist.