Xiaomi India — While redeem the mi coins in GETAPPS it always shows out of stock

Dear sir/madam

I cannot redeem the product according my coins.I always try at 10:00a.m. and 3:00p.m. also fill captcha code within 5 second and press ok then it shows out of stock.I comes daily to redeem product in getapps but result is same.Please solve this out of stock problem, increase your quantity of product & make it 24×7.