Allahabad Bank — Dispute a fraudulent

My mother have account in Allahabad bank in Agota branch. On dated 5th Oct’2020 my brother visited in bank for depositing the amount of Rs.40, 000/- and while the process he asked for the receipt of deposit on which the manager replied that they do not provide any receipt to any of their customer and this is their protocol. After massive argument on this, branch manager said he can only update the passbook in hand written manner. And the same instance happened again when he deposited amount of Rs.67, 000/- dated on 24th Nov, 2020, again the bank manager denied to give the receipt of deposit with bank stamp.
When we came in the requirement of money and visited the main branch for withdrawal we were surprised to know that none of the amount was been credited in account. We immediately reported this issue with branch manager on which he told that we have to visit the sub branch for further investigation where we had deposited the amount (40, 000+67, 000), because they were not having any details of that transaction done in sub branch.
On the given instruction we again visited in the sub branch for investigating the matter and raising the complaint. We escalated the case with above said manager of bank and got response that “there must be technical glitch so that is why amount not yet credited and not showing in your account”, and said “we will sort this issue soon and update you once resolved”.
Post this instance we had visited multiple times and every time they gave same response. Two months of the incident have passed and no action has been taken so far even though the fraud was immediately reported. This is very mournful to inform you that the staffs are not helping us in any manner and it looks very suspicious by the behavior of the bank manager that he has intentionally done this and looks he knows everything about the fraud. I have more clues and testament about this and will ready to disclose once I get the concrete and fruitful response from your side.