Can a debt collector increase the interest rate on a debt I owe?

A debt collector may not collect any interest or fee not authorized by the agreement or by law. The interest rate or fees charged on your debt may be raised if your original loan or credit agreement permits it. Some state laws and some contracts allow interest to be charged and costs to be added. If you still have the contract, it may say what interest rate can be charged or how much it can increase. State law may also limit the amount of interest charged.   

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