Supposed ***** on my account - no proof or information provided

My account has been blocked and my card stopped. I have spoken with two different consultants and all they can say is someone else called and said there was ***** on their account, but my account is now effectd. The consultants cannot tell me what happened to my account for it to be blocked. I was NOT contacted or notified that my account was blocked. I found this out while doing shopping and was told at the till that my card had declined (this is one day after my salary was paid into my account). I have committments and debit orders that need to be met. The service is pathetic to say the very least. I will be moving to another bank once this is resolved.