Bad service credit shift limit

FNB systems are failing of late...I app**** for credit and attained it within the second day I saw a transaction which seemed like ***** bcos I didnot make a purchase then I decided to mitigate the risk as I had received increase at the moment, by doing credit limit shift and not decrease in credit, the system decreased my entire amount and I followed up via suite they say it's systems and next day again they say I must apply again that's...why must I apply again when I had just received the money in 2days and it's their error..I have been a client for 5years and I know how to utilise the credit shift limit function been using it for the past years...I asked for an escalation the consultant says head office will take 3-5days to respond and I should email which I have already done they hardly respond on ***... why do we pay for private banking with such service...very disappointed with FNB I must say ...I was getting ready to travel the inconvenience this has caused...my 'trusted bank'