Bulk Delete Supplier Address Contact

Summary

Import Action of Delete not working Supplier Contact Addresses FBDI

Content (please ensure you mask any confidential information):

We have a supplier , lets say Vision Supplies.
This supplier has an address in CB4 0FL (Zip Code in the UK)
For this supplier 
a) there is a contact , Accounts Payable with email abc@vision.com
b) This contact, Accounts Payable is associated to this address CB4 0FL, with email as xyz@vision.com.
We are required to bulk update the supplier emails ideally to MASK it
where in
for  a)  above, we are able update the email to demo.abc@vision.com