How does ones account get closed without notiice?

I opened a gold cheque account on-line in May and i couldn't get my card immediately due to proof of address & postal delay i didn't have an updated proof or res document. Finally i managed 2 get it & i collected my card on the 8th of July @ the Rosebank branch, updated my banking details with my employer suddenly today as its pay day,no notifications came through,the account wasn't appearing on FNB app nor on-line banking. I was put on mute for more than 5Min's by enquiries desk than transferred to another department after 10mins on that call. The account is closed my salary is sitting somewhere,i have debit orders & other responsibilities. How can a cheque account be closed in less than 3 months from the date it was opened & why wasn't i informed of this? Am i now suppose to go up & down as well as be inconvenienced? What about the costs incurred? I have never experienced such terrible service from such a great bank which i have recommended to almost every family member & close friend. Im stuck with no money & my employer paid me on time.