Paytm Mobile Solutions — order no [protected] of 29.9.2018

I paid for above order no amt of rs 3999 n on cancellation got refund of rs 3199 on 8.10.18 balance they say is in goldback but there is no gold back credit in my name/account.whereas on cancellation my whole amt of rs 3999 should hv been refunded. Rs 800 of mine are usurped by paytm fraudulently, i want it refunded
Vinod parashar