Make these collections calls stop! Give us a call at 1-855-697-3825 or send us an email at firstname.lastname@example.org and we can have those calls stopped for you. Related articles I keep receiving calls from SIMM. Who are they? When will I be sent to collections? What is my credit limit, and how do I increase or decrease it? I got a refund on a purchase that meets the minimum payment this month. Do I still need to pay? How does AutoPay work and where do I set it up?