Freezing account without any communication

FNB you inconsiderate piece of **** company. Sending me a sms to say my account is frozen due to required documents that FNB does not have(my proof of residence and ID copy). Without any communication and just a stupid sms to say that they have taken action. How will I have an account if I have not given the necessary information in the first place 2 YEARS AGO? I had a business account still in the beginning of THIS year where they had my information AGAIN with my ID that was scanned @ a FNB branch. So how the hell can FNB just take the action of freezing my account???? How is it even possible for you to just do that?? This is an ******* ACTION and I will take action against it.