There are both state and federal laws regulating debt collectors. Depending on the details, it sounds like this conduct may violate the Fair Debt Collection Practices Act, which is a federal law. There are no doubt laws in your state too that regulate debt collectors, and may be even stricter than the FDCPA.
In addition, mortgage lenders and servicers have many duties and obligations, under both federal and state law, and from your question, it appears that they may be violating the federal laws. Since I don't practice in your state, I don't know the state laws that are applicable.
You need a consumer law attorney who is knowledgable in mortgage foreclosure defense and consumer debt collection law to obtain the best result. The National Association of Consumer Advocates (NACA) is a non-profit consumer advocacy organization. NACA maintains a web site at www.naca.net where it lists geographically consumer law attorneys all over the US. If you don't already have an attorney, please look there for someone in your area who can help you.