Air Asia — payment for seat booking

Address:

15 secondcross st, seethamal ext, Chennai, Tamil Nadu, 600018e

I booked my tickets for newdelhi from chennai for28th morning flight, with pnr no z1y3xw, then while selecting the seat it said rs.350 each for two tickets 700 and directed me to make payments, i made payment through internet banking but the final amount detected is 1200 ie 700 for two seat and 500 for service charges, i am unable to do my web check in, it says payment pending. I made complaint by phone, said amount will be refunded. But no refund made. Says pending payment. Resolve. The issue