CARD DECLINED

I increased my daily limit to cover a large purchase that I was making later on that day. When it came to settling the amount with my card, the transaction was declined. The message I received was that I need to increase my limit. I did so again and still the transaction was, once again, declined. I received no other notification from Discovery Bank and could not use my card that day. On the following day, I called the call centre and was transferred to the ***** department when I was advised that my card had been blocked due to suspected *****. I find this matter unacceptable and would like to have urgent feedback as to what transpired.