If we are not getting (even) accurate fatality data due to unreported cases, there is no way of knowing how fast this is still growing, we only have a minimum rate.
It's evident that nobody knows the true case numbers, where they are, what they've done, etc.
As far as panicking and running, a lot of people have apparently already done that. Cases have popped up in 6-7 Angolan provinces already. Due to "administrative reclassification" which was done last weekend, only the cases in Uige that have come to the attention of the medical and civil authorities (and which have been laboratory confirmed) have been counted. We know that there is a significant undercount--but nobody knows how significant. The very fact that there was an "administrative reclassification" would lead me to think it is a substantial undercount.
After decades of war, the infrastructure is destroyed. There is no way to get it up to speed to respond to this outbreak.