The Fishpond ‘3 to 4 weeks’ needs to be compared to a reasonable time for them to respond to a Letter of Complaint. I would give them 5 business days, 10 at most. That being written
Read the T&C for refunding. A claim could be denied IF your parcel is delivered in the interim. One can always submit a claim but whether a business accepts it and why or why not is a germane consideration.
That is what I would do on the basis of the text stated to be included in the order.