Meena,
It is my opinion, asking the very same company, who might be potentially overpricing us to for explanation is laughable. How can we find out the real cost? From what I now at this time, the cost might be between thb 32 to thb 3,600 for each button. 
1) Can we find another company to check?
2) If not, can we file a formal complaint to investigate potential overpricing with relevant Thai authorities? 
Thank you,
Tomas