Tardy courier company

While this is a great fashion online store, I had an issue with the courier this week. I logged a return/refund on Sunday, 17 November. on Monday 18 November the item was promptly collected. I live in a security building and the courier left the item in error on the desk downstairs at security. I called Superblist and they responded by letting the driver know that he forgot the parcel. it is midday 20 November and the item is still at the security desk. I have since emailed Superblist twice.