Wells Fargo Bank N.A. Charging my account with monthly service fee unknown to me, Internet

I am a client of Wells Fargo Bank for a few years. I always kept more than $20,000 cash on my accounts with this bank. During last few months Wells Fargo started to charge me $25 fee that never was charged before. I wasn't informed that bank is going to charge this fee for the account with good amount of money. I kept account active. Wells Fargo just decided to rip me off. I was planning to have more business with this bank, but completely changed my mind to do it when I discovered this unfair fee. I keep huge amount of cash with this bank, get almost nothing as interest (a few dollars per year) and now they charge me fee for the privilege to use my cash!!! I am going to close my account as soon as possible and transfer money to any other bank that not greedy to rip off good clients.