To cancel an ECS mandate linked to your SBI savings account, you have two options: online and offline. If you prefer online convenience, log in to your SBI internet banking account, go to "e-Services," select "Manage Mandate," and then choose "Cancel Mandate." Select the specific ECS mandate you wish to cancel and submit the request. Alternatively, you can visit your nearest SBI branch, fill out an ECS mandate cancellation form, and submit it with your account details to a bank official.