Air India Express — money deducted but no valid ticket issued

Address: Air India building, Nariman point Mumbai, Mumbai City, Maharashtra, 400021

Yesterday (16/11/2019) i booked ticket in air india express flight schedule on 23 november 7.40 hrs on trivandrum muscat sector through member login page of air india express website
But money transaction not completed as there is delay in getting otp
Later i found the this booking in my bookings in the member page of air india express website
Which shows to retry payment to complete transaction. Accordingly i paid money through sbi atm card and i received otp and entered otp in the merchant site
And rs. 11587.69 deducted from my bank account by air india express company ltd mumbai
But issued a ticket which shows no money paid with confirmation number wmgaip
And this booking not found in the air india express website and the previous booking disappeared from my booking
I checked the sbi website also which shows rs 11587.69 deducted with details othpg[protected]airindia charters ltd mumbai but issued invalid ticket showing 0 money paid and not available by retrieve booking by the same pnr
Now what l will do to get money back
Thanks