Is southwest collection services calling you? The phone numbers for Southwest Collection Services are 1-877-981-4542 and 1-337-981-4542. If you see either number on your caller ID, be aware that a collection agency is calling.Who is southwest credit system? Southwest Credit Systems, LP (“Southwest”) is a debt collection company located in Carrollton, Texas. A quick search of the web reveals multiple complaints about Southwest and its collection methods.What is southwest credit collection company? Southwest Credit Systems, L.P. Southwest Credit Systems, L.P. is an Texas collection agency. Texas collection agencies can help businesses, medical practices and facilities that are creditors to collect their accounts receivable.What is southwest credit union? Southwest Federal Credit Union. Southwest Federal Credit Union is a decades-old credit union with the latest technologies, a full range of products, and the very personalized service that only a Credit Union our size can provide.