u/One-Captain2236

I bought an item two weeks ago, returned it because it wasn’t the correct item as it was something the seller had confused with a different piece, seller asked me to return it and then said they would refund me afterwards. The item has since been delivered a week ago, the seller has closed their shop and I have sent a message asking if they got the item and if it was in good condition to refund me but they haven’t opened the message. Is there anything I need to do? I paid for tracked postage to make sure it arrived and I know for sure it did.

Uk based buyer here, purchased a piece the other day, seller marked the item as shipped on the 11th with Royal Mail tracked 48, now I haven’t had an email from Royal Mail regarding my tracking number as normally they send you an email with details,and no obvious tracking number has been provided. Considering it’s the 15th at the time of posting should I be concerned that nothing seems to be happening?