Provident Funding Late Fee Scam Nationwide

I have had no issues and paid my mortgage on time with this company for many years. Now in September and October of 2015 they have started charging me late fees even though my payments clearly have reached their offices on time. Why am I sure? Because no company has charged me a late fee on any payment for more than twenty years but Provident Funding just hit me two months in a row. I have read elsewhere that their scam is based on only picking up their mail once a week so they can hit customers for late fees. Please--will some state attorney general investigate these crooks?