There is no law that I’m aware of that compells collectors, who own the debt, to agree to any payment plan! Don’t believe the myth that collectors, who refuse payments, forfeit their right to collect the debt and that the debt goes away. This is just not true!
Under those circumstances where collectors are working on behalf of a creditor, the collector is obligated to submit all reasonable offers to the creditor. In this case, only the creditor, has the right to refuse your payment offer.
Collectors who own debts can refuse your payment plan (and they usually do). However, collectors who refuse reasonable payment plans run the risk of losing their case should they pursue court action.
This is why it’s so important to put payment offers in writing and keep accurate records of all efforts to resolve the issue.