Uber India — credits

I am registered with my phone number [protected]. I requested a ride in Singapore on Nov 17th. The ride could not be completed as i could not contact the driver. I complained and i got $6 credits as it was charged to me. I could not book any other ride after that ride as uber app asked me to pay before getting another ride. i came to India and paid by PAYTM to clear by balance. later i received a message that uber credits are country specific and your $6 can be used later. When can pay in Indian currency why uber cannot credit by account balance in India for a ride in Singapore. I need my money back