Search for their name + scam and you will find some.
I would try to get the deposit back, but long-term doing the CELTA would be a better choice- you can work anywhere with it. The American TESOL Institute is at best one of the minor providers of course that might be equivalent to the CELTA.
September 2012
I am about to leave South Africa and do a TESOL course in Thailand --- I have spent about 5 months researching the various colleges there and can offer the following advice gleaned from teachers / friends / internet / .......
1- check the jobs vacant and see which colleges are accepted by the schools - no matter how fancy the college is where you did your course, if your prospective employer does not recognize it, it becomes worthless
2- try do a course that has the MOE (Ministry of Education) stamp of approval also ask for the colleges license number
3- See if the college web site has a .th domain name. To obtain this they need a registered business with all the relevant documents etc. ( check out how strict the requirements are to obtain a .co.th domain )
4- Send the prospective college an email query or two and see how long the response takes, this should give an indication of not only how professional and efficient they are, but also how dedicated they are to customer satisfaction they are ( most of them are just after your money)
HOPE THIS HELPS