Gst input on bank charges

My Bank charged GST on service charges in Feb 2018 but till now the credit is not reflecting in my GST number in GST portal- as per bank many customers are facing this problem and that it can not be claimed now since the return filing has already been made for that period. I think bank has not deposited the GST amount in my GST number.so where has they deposited the deducted amount and  how do i claim it now? 

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