Stop customer buying if no delivery address inputted.

[Mr-Fragrance]

Hi,

A customer placed a order on my site, no delivery address or telephone number was inputted, my store has accepted payment. We only have the billing address; from previous orders we know the billing address can be different. Over 3 days, we have reached out to the customer using email, no reply, we assume emails are ending up in the junk folder. 

We want the delivery address to be completed as mandatory. How do we set this? Thank you.

Regards