YOU have rights UNDER the FDCPA here is the link to the information http://www.ftc.gov/bcp/edu/pubs/consumer/credit/cre27.pdf

Debit collectors are rude. There is abundant evidence of the use of abusive, deceptive, and unfair debt collection practices by many debt collectors. Abusive debt collection practices contribute to the number of personal bankruptcies, to marital instability, to the loss of jobs, and to invasions of individual privacy.

Harassment or abuse
A debt collector may not engage in any conduct the natural consequence of which is to harass, oppress, or abuse any person in connection with the collection of a debt.

Within five days after the initial communication with a consumer in connection with the collection of any debt, a debt collector shall, unless the following information is contained in the initial communication or the consumer has paid the debt, send the consumer a written notice.

We have right they assume we know nothing about they are wrong, do your research about the company and know your rights, RCM is just the debt collector for the company which you owe money to. If they cannot collect then it gets sent back to the original company who then finds another third party to collect the debt once again the cycle begins. Know your Rights