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There is no question that you should get it in writing. Make sure that the person writing the letter includes a representation that he or she has the power to make the statement that no foreclosure action will be commenced by virtue of the late fees.
Your mortgage terms control....You agreed to the terms at closing. It is not inherently illegal.
Here is the PA statute about notice of intention to foreclose. NOTE that it provides for foreclosure for unpaid monthly payments 'AND/OR LATE FEES"