Tomorrow we will send all revised invoice and receipt/tax invoice since Apr. 2016 until now to you by email ( For original, please advise to K. Chittima and K. Karunaporn how to send it by post or flight? ) As you mentioned, the address for last invoice was changed due to we already updated your information on our customer lists. And you will get the receipt/tax invoice after we receive your payment on that invoice. For the procedure of vat refund , we highly suggest you to have a Thai representative to process and consult about it because there is more complicated process. This is website about VAT www.rd.go.th but almost information may present in Thai.
Regards,