State Bank Of India [SBI] — pos transaction double debit

I could not submit pos trsanction complaint trhough cms portal. Every time while trying, the message pops as pl check your card number)
I have made a purchase through pos (Debit card) on 01/07/2017 for rs.2564.97, but my account was debited twice (A/c no: [protected] maintaining at sbi ind estate road br trivandrum (Esbt) i have given awrittin complaint with all documents to chief managet, sbi (Code 70020) on 14/08/2017 and submited a complaint to sbt complaint system (Ref no at6547 on 09/04/2017)
Pl advise me what further step i have to take, should i complaint to banking omdusman