The seller may not have seen your message, silly to ignore it , as you have stated you cannot possibly collect the item.
Send them another polite message saying it's too far to come to collect, please cancel the order. Advise them, perhaps they do not know, if they cancel citing Buyer Requests to Cancel, then their seller performance is not affected.
If they continue to ignore, you will have to wait until 7 full days have passed then open a case for item not received, and escalate on day 4 if not refunded beforehand.
@131tabby
