Thai embassy in Malaysia seems to be strict. If the school you used for the application can not provide the document requested by the embassy, your application will not move forward. I recommend you contact new school that able to provide the documents requested. Or else you will have to reapply at another country. Visa fee is so cheap though only around 10,000 THB and you get 5 YEARs visa. Dont understand people who says the visa fee is expensive. LOL