I don't know if they spam at Tutor ABC, but what I see is that they use wumaos to post ridiculous "positive" reviews, as if people are stupid enough to believe those very obvious attempts at fooling people. They seem desperate to attract online tutors.

My advice: Don't contact them. Schools, online or not, that use wumaos are schools that fool the public. They will fool teachers as well. Students and parents. That's their modus operandi, their way of dealing with life.