Dell English School, is owned by Pearson or Longman in China, operating under the name of Longman Schools.

Can you verify this?

As you didn't respond, I am not sure if you simply got the wrong school or what, but I have not seen any mention of Longman Schools in connection to Dell English School in Songyuan. The Songyuan school was founded by Dell and it is not a branch of another school. I also looked on the Longman Schools website, and I was unable to find any link to Dell English School in Songyuan.

Now I can chalk this up to a misunderstanding, but as it is followed by pretty negative comments, I would hope you would clear up this confusion.