Who called from 5155287520

They have been calling me 3 to 4 times a day fpr the past 3 days on my cell It's getting very irritating

I have been 3-4 calls a day in the afternoon from this #515-528-7928, left voice messages talking about serving me with a summons at home or place of employment if I don't call to settle out of court. I have not and will not answer or call back, and from everything I've read it is a scam. I have registered a compaint with both the FTC and Do Not Call Registry.