Garena has launched his Payment Inquiry Center so you can report your issues, bugs with payments or GG Shells etc..Visit this page to contact, Garena Payment Support http://support.garena.com/enquiry/payment.php
Fill the form correctly by entering your UserID, Account Name, Account, Payment Gateway etc...
Also provide 1-2 screenshot with it.
Wait 2-3 working days, Garena will contact you about your problem. Also subscribe to Dota Utilities to get every latest update.