Oh Dear, I am sorry to hear that your child is unhappy at school.
It is not easy to get good school here in Doha even though you are paying sinfully large amount of money.
I suggest that you go and see the teacher .. but instead of shouting back etc just discuss calmly explaining that your child is still adjusting and not quite used to the class, school etc and ask the teacher if she could suggest ways in helping out your child to adapt with the new surrounding. I suggest the first approach to to raise/discuss the problem but don't put the blame on the teacher. This may but not always work..talking to other parents in your child class may help as well..also try to encourage your child to get to know the classmate may reduce anxiety.

But if you think the teacher is beyond reason and you are absolutely sure that the teacher IS the problem by all means shout back and demand that the teacher is replaced!!!