My son just got this phone for Christmas and just got this number they have called non stop I tried to tell them This is my son's phone and we just got this number on Christmas eve.. He is only 6 and it's just a little 15 dollar phone he can bring with him to his grandparents..
After confirming from the original creditor that my account was turned over with the Phone Number referenced on the noticed, I've been in contact with them.
One thing if you get a call/notification from a third party is to make sure from the original creditor that they did turn it over, and keep them in check by checking your account online or on the phone that payments are being applied.