Inconvenience due to cellphone banking airtime purchase limit!!

I have been an FNB customer for a while now I have always used both my online and cellphone banking for various transactions until this past weekend when I tried to purchase airtime with my cellphone banking. To my horror I got a message saying that I have EXCEEDED MY DAILY LIMIT? FOR PURCHASING AIRTIME? WITH MY OWN MONEY ALBEIT IN THE FNB ACCOUNT, IT IS STILL MY MONEY!! I could only buy R20.00 airtime and no more, OR I had to INCREASE MY LIMIT on the app, which I did and received an OTP, which did not EVEN WORK . What kind of nonsense is FNB up to with airtime limits? since when? I was stranded and had to go buy airtime as if I did not have cellphone banking? Even Capitec customers or any other bank for that matter their customers do not have airtime limits? What an INCONVENIENCE for a bank which claims to be ahead of others in terms of customer service and care. Whatever you have decided with the cellphone banking airtime purchases is VERY SHAMEFUL AND A DISGRACE to put your customers through such INCONVENIENCE!!