How long after not receiving product can I ask for a refund?

I ordered a pair of loafers over a month ago, and they've been stuck on the second step of the tracking process, both of which have been labeled with words that literally don't exist. Getting a tracking update that says "He'il be here" and then no more info for a month really isn't reassuring. The seller isn't responsive either, when I messaged them and brought this up they just said "hi yes all fine"...