Whats the easiest way to stop sip in regular fund?

Should I just cancel the bank mandate or will doing so involve penalties? Whats the proper way of doing this?
I had invested offline through an intermediary.

Where are you investing?

currently investing in 4 different sip’s where funds get deducted from bank account every month. They were started through an agent.

Delete the bank mandate and contact Karvy/Cams and submit a SIP cancellation form.