Buyer made mistake but insisting my listing is wrong to avoid paying return postage

[toppov]

Buyer purchased one of 4 options on a multilisting that required her to choose an option from a drop down box 

On receiving the item she claims she thought the listing was for all four items & that my listing title was not clear.

I'm happy to accept the return as a business seller but not pay return postage. However her 'as not described' case means I have to pay postage.

What are my options for rectifying this - eBay aren't taking calls right now 

[pixiesen2012]

what was the item?

I can't see any multi item listings in your sold history