Yes, you can withdraw your online application, as mentioned on CIC website:
You wish to report important changes, such as a change in contact information, births, deaths, marriages, divorces, adoptions, changes in employment, withdrawal of application, refund request, or urgent requests. If you are reporting a change in contact information, it will take 5 business days for it to be updated. During this time you should continue to monitor your old contact information.
So you can go to this link and fill out the form: https://secure.cic.gc.ca/enquiries-renseignements/canada-case-cas-eng.aspx
But make sure you are confident for what you are doing. As, it may (or maynot) be close to completion of processing at Chandigarh.
Is it best option ??