FNB blocked my account for no reason

Basically FNB blocked my account without informing me and without stating any reason. I tried to phone the customer service and after about 10 attempts and 20 minutes on the line, i was informed that they "may unblock the account after 48 hours", otherwise I'd have to phone again.. Incredibly unprofessional and unacceptable. It's difficult to find a reason not to close FNB's account and switch to another bank with a decent and reliable service.