Terrible service, an event i was to attend got can...

Terrible service, an event i was to attend got cancelled due to Covid, and my booking was supposed to be canceled. Delta didn't do it and didn't want to refund me since I prebooked. Cancelation happened months ago but just found out today they didn't cancel my rooms, called these jokers and they started the ole, "well since you pre-booked you can't get a refund routine."