I will check with him to find out. Did you treat the underside of each leaf with the safers(insecticidal soap). He did say that it was very common with some plants.
I have no idea if this would work or harm them, just an idea. What if you removed all their soil(transplant) in case these bugs are in it. Set up your tob with the insecticidal soap and dip the stem and leaves. This way you won't miss any of the plant. Plant in fresh soil.