Delhivery — Not Returning the Money they Forced to Add in Wallet

Address: Company has various offices. (Indore M.P.)

I used to regularly ship using Delhivery Direct to my customers. Keeping in mind the volume, I decided to setup a Delhivery business account as their executive said the charges are comparatively lower.
When I setup my account I was ready to book a shipment. To my surprise you cannot create a Delhivery order without adding money in wallet. Since the charges were Rs.250/- on Delhivery Direct, I assumed it would definitely be lower on business account so I added Rs. 250/- in wallet and went ahead to book order. On Delhivery Direct amount for 5kg parcel was 250/- and on business account it was around Rs. 350+
I decided to stick to Delhivery Direct only to ship my orders and wanted back the money added in Delhivery Business wallet back into my bank account.
When I raised an issue regarding same, they said I will have to completely close the account in order to get the money back. Now I'm scared that if I completely remove my account, will there be any evidence of me adding money in the wallet?
I understand the amount is little but the concern is not money but the method of operation and ethics.
In this world of digital india, a company like Delhivery whose IPO is round the corner, is cheating customers to forcibly add money in wallet even for a basic shipment planning.
Please look into the matter