Product: Checking or savings account

I have been a client of Chase bank for roughly XXXX  years. My personal ( joint with my wife ) checking account has always had a positive balance. I am a good client and never have done anything that would even make me think that I would receive a letter out of the blue stating that Chase has decided to close my personal checking account, although I do understand that Chase has the right to decide to close any clients account ( s ) or credit cards at any time without giving reason. 
On XX/XX/2023 I received XXXX letters in the mail from Chase ( the letters are dated XX/XX/2023 ), both stating that Chase has decided to close my bank accounts. My personal checking and savings account ( which have always kept a positive balance ), as well as an old business checking account ( which has always kept a positive balance ) that has had almost no activity over the past few months with minimal funds in the account.

The letters also stated that Chase has decided to close my personal Chase credit card ( which I've worked years on building a respective credit score and credit limit, and I believe I have never had a late payment on ), and an old Chase Ink business card that is linked to my old Chase business account that has had very minimal activity over the past few months, as previously mentioned.

The Chase XXXX XXXX credit card that I was notified about being closed has had an outstanding balance, as I've not used that card for any physical purchases in the past few months. Therefore, I did forget to constantly check on my credit card balance for that specific Business credit card and let a few charges that were on file ( auto charge ) accumulate to a total of not more than {$300.00}. The payment on this specific Chase XXXX XXXX credit card was a late payment ( I made the late payment on XX/XX/2023 ). Included in the {$290.00} payment, I also received a late payment fee of {$40.00} ( on XX/XX/2023 ) and a purchase interest charge of {$3.00} ( on XX/XX/2023 ). The entire credit card balance was fully paid off ( on XX/XX/2023 as mentioned above ). 
The Chase Business bank account that I am being notified about closing has had almost no activity over the past few months. The current balance in the account is less than {$200.00} and therefore causing a service charge of {$15.00} per month that the account had a balance under either XXXX or XXXX XXXX dollars. 

The reason given by Chase for closing my accounts and credit cards is as follows : We decided to close your account because of unexpected activity on these or another Chase account. 
I am unaware of any activity associated with my bank account ( XXXX ) and credit card ( XXXX ) that should have flagged any unexpected activity. 

My complaint is that as a loyal customer of Chase bank for roughly 8 years, combined with personal banking, business banking and credit cards - I do not feel that this notice I received is accurate ( based on the reason chase has given for closing my accounts and credit cards ). I am also unhappy that my wife and XXXX sons ( age XXXX and XXXX ) also received these same notification letters stating their bank accounts and my wife 's personal credit card will be closed. I do not feel that there is any possible way my wife and XXXX sons with minimal activity in their accounts could have possibly had any unexpected on their accounts.