Barclays PLC Credit Card Complaint

Barclays PLC Credit card department,

Closing/Cancelling account Texas

My credit card issued by Barclays was closed without notice. I received a notice saying the account was closed for 'unusual account activity ' and that my credit was not use in the decision. I would like my - $ annual fee refunded, and the - $ in unclaimed rewards credited to my account. The bank would not provide further explanation as to why my account was closed, and they refused to credit my account for the unused points or already paid annual fee. I find this behavior akin to a bait-and-switch. I used this credit card under the pretense of earning rewards, until the bank decides to unilaterally close the account and deem my earned rewards void.