Kotak Mahindra Bank — Fraudulent transaction in account

There was a fraudulent transaction done on dec 3rd 2020 in my mothers kotak mahindra bank account of rs 30000 ( rupees thirty thousand ) this occurred
While we were out of the city. I immediately blocked the account and all access to it there was a request number given to me by the bank as ( 1-[protected] request no )
i have made endless follow ups with kotak mahindra bank, filed police complaint, submitted all documentation what was asked by the bank.
They have given shadow credit of the amount of rupees 30000 and i was told that the investigation is going on and approximately it would take about 90 days or earlier for the bank and they will send an update about the status of the same . My mother is a senior citizen and had to personally be present to visit the bank to file complaints etc ...we have visited the bank made endless calls. There is hardly any updates . I have to keep calling the customer care and am told that here would be a revert . Theres hardly any !! Please revert as to when the amount of shadow credit will be credited to my account..and what is the status ????
Being in a different city at the time of this fraudulent transaction, it was simple harassment especially for my mom (who is a senior citizen and also suffers from diabetes and pressure problems) to get documents, run here and there to file a complaint ..for no fault of hers...
Please revert.