Bangalore Metro Rail Corporation — looting money by not giving 'change'

Address: 560038

Hi,
I gave a ₹50 note on counter for a token from indiranagar to yellachenahalli which costs ₹45, on asking for ₹5 change, they simply said they didn't have any change without looking at their cash drawers, and did the same with every passenger in queue.
Same happened on the return journey @ yellachenahalli station. They were reluctant to give any change.
Moreover reaching back indiranagar, the parking guy also charged ₹10 for bicycle whereas only ₹5 were applicable, giving 'no change' as a blind excuse.
I see many passengers with similar complaints, please do something urgently so not all passengers should suffer.
Heavy corruption going on counters of bmrc.