Specialized Loan Servicing LLC Mortgage Complaint

Specialized Loan Servicing LLC Mortgage department,

Other mortgage Loan modification,collection,foreclosure Oregon

Got behind on modified mortgage payments. Received letter from SLS, LLC to catch up all payments or will go into foreclosure dept. on -/-/16. So we set-up an Informal Payment Agreement Plan. Have made two payments so far. They keep calling me aggressively. 1 ) Can they demand that I set-up my checking a/c with automatic withdrawals until I catch up? Also stated that phone calls would end only if they can secure my checking a/c! 2 ) Can I get the Informal Payment Plan in writing Thank you.