Worse experience ever

I have been having a payflex account for 3 months and always buy food online that helps me alot.I pay my full balance every month once i get paid, I never wait for a full 3 month installment always pay full balance,, Yesterday i paid the full balance then my credit spend limit was R1640.When i wanted to purchase online it suddenly says that i don't have spend limit. That is so ****en disappointing, If i know that then i was never gonna pay full balance ,id rather wait for the due date for payment.