unable to purchase using my credit card even though my card is ok and apple support have said that they have fixed the security problem

Yesterday I was unable to purchase an APP even though my CC is OK. Restarted, retyped into account, asked for support. Support said all OK in 30 minutes. Waited an hour the could not contact support for a call back. Support did advise it was a security glitch and as I mentioned would be OK in 30 minutes. Waiting all weekend. Using a MAC B P