How to bulk delete contacts

Go to Workflows > Data flow. You can also access it from Admin console > Workflows > Data flows

Create a new data flow with following source and destination

Once created, you will need to add the following in JSONATA expression if your key identifier is phonenumber:

If your key identifier is email, then use below

Now, you can export contacts from a list or segment or the contacts page, and upload here in the data flow.

Click on Save and then click on Run Now

You can Edit data flow to upload more files and then again click on Save > Run Now.