Zeta — amount not credited to my zeta ac

Address:

Azamgarh, Uttar Pradesh, 273301

On 21nov 2017, 500 rs, i add money from airtel payment bank acc. To my airtel credit card but it was declined. I tried for 2 times and the same thing occurred. But no message came and from my cash card plus 500 rs got deducted. I want to know where has that 500 bucks went? Bz i have not got a single penny. Your service sucks...
Ab tak amount nhi aaya