Bulk deleting contacts

By importing my contacts into ZOHO-Connect I unintended send everybody(!) an invitation to join ZOHO-Connect! I was not aware that this would be the consequence of importing the contacts and I think there should have been a warning/notification prior to sending everybody (EV-ER-Y-BO-DY!!!) a ZOHO invitation in my name!

I feel very bad and embarrassed by this! Now I have to quickly delete all these "pending contacts" one by one. This costs several clicks per contact and also Connect shows error messages all the time ("please try after some time").

Is there no way I can quickly delete everybody?! Also, was this mass-invitation legitimate?