Did the usual top-up via Internet Banking this morning, and saw that the credit wasn't showing up on the 8ta dashboard. Contacted 8time and got the following:
"We are currently experiencing technical problems and are working together with 8ta to resolve them ASAP. Your recharge is important to us.
We will process your recharge as soon as we are back online.
Thank you for your patience."
Hope they sort it out quickly - down to the last 100mb now!