Bigbasket.com — money taken out of wallet without consent

In the beginning of lockdown i have tried to order ration for which the transaction was accepted and suddenly cannot deliver the items due to lockdown imposed. Since then i have been waiting for next slot to be available which never happened for 2 weeks. And i have since been checking everyday for available slot. Finally today we got 1 slot available and tried to order the rations for the amount in the wallet. When checking out i found out that all the money in the wallet (Which is rs.1079 from 1500) have been taken out without my consent. I only came to know this because they were charging more during checkout. Which they should be deducting from the wallet that i have already paid last time. What service is this? Utterly disappointed. Have been loyal customer for more than 2 years now and they betrayed badly. I have even subscribed for a bb star so that i could get priority in deliver but instead they played badly.