Forex receipts can't be processed

I'm trying to process a Forex receipt but there's a glitch on the online system that isn't allowing me to update my postal code from the generically set one of 0000 so my receipt can't be processed. I went into FNB Northgate today and, after queuing for 30 minutes, was told by the consultant that they can't assist with Forex queries in the branch. I've tried getting help through Secure Chat but it will not load either on the app or desktop. My receipt is going to expire soon. Please assist urgently.