I.C. System, Inc. Debt Collection Complaint

I.C. System, Inc. Debt collection department,

I do not know Communication tactics Frequent or repeated calls Pennsylvania

Called - twice. I answered both calls and no one was on the line. The line disconnected. Have called 13 times in the past four days, not including the two calls listed above. These calls I did not answer. Researched number on web to find out it belonged to I.C. System, INC. -, - -, MN -. These are obviously robot calls.