Refund of Credit Ledger balance

I am a trader of small trader of leather goods. I procure goods totally from unregistered dealers and sell a part of it to merchant exporters at 0.1% gst. Due to reverse charge i have to deposit the tax each time in cash and the tax liability is only 0.1 on sale. So the balance is being accumulated in the credit ledger. 

1. can i claim refund from credit ledger?

2. If yes, then how and what are the documents required. Is there any problem as purchases are from unregistered dealers.