The reason I put Atos on my blacklist is experiencing a case where their contracted support was so bad, I had to do things twice - first I had to do what they should do, then design a step-by-step document that graphically showed each button to click (essentially "programming the person") and send that to them...

After escalations, they finally noticed client got angry and suddenly there was someone skilled at the other end. But I suspect it was exception and only for a short time.