I’m a buyer being scammed

[user_25]

Hi Firstly thanks for taking some time to read this.

i sold an item valued at £500, I accepted £425.

the buyer is saying I sent the wrong item.

(they took the original item & replaced it with something else)

i am 100% certain I enclosed the right item.

I am very upset by this, I pride myself on my eBay, I have a wonderful relationship with buyers & sellers. 

eBay have told me to send a return postage label.

I am 100% disputing this.

If I do what eBay have said, does that mean I don’t get paid & the buyer runs off with the original item for free?

[jokers_toybox]

I do consignment sales for customers who want to sell their cards, I usually take them to card shows where the sales can be done in person. 

Selling on behalf of someone is not against any eBay rules as far as I know as long as the sale is legit. 

I'm happy to discuss my processes for this if you want some reassurance