Can't get refund for Manchester?

[M Holmes]

I ordered online and asked for tickets to be held on the door. As the
building was closed, these couldn't be collected. Ticketline require
tickets to be sent to get a refund. I've emailed them, and they keep
advising that I need to send tickets to get a refund.

I'm already out 150 quid on the Manchester trip.  I'm damned if I'm
going to let them scam me out of the ticket money too.  Any advice on
how to proceed?

FoFP