I got a full refund but did not get all the money I have paid

[ebuymk]

Hi, I have placed and paid an order on October 21, 2019. The next day, October 22, I have received a message from seller via Ebay that the item was shipped. The shipping from UK usually takes 4-6 business day to arrive. After 3 weeks I have contacted the seller if he has the tracking number. He apologized and told me that the order was not shipped due to his customs problems. Actually, he has not even received the item he was already selling on Ebay, and marked it as shipped when he got my money.

He offered me a full refund today, which I accepted immediately. When have I checked the PayPal refund information, I have seen that I haven’t received all the money I had paid. My problem is, besides losing 3 weeks waiting for nothing, that I have paid 100.96 euros for this purchase and now I have been refunded only 95.82 euros. I see there is a difference in conversion rate between EUR and GBP, but I believe there should not be such. Is there any possibility I can get back all the money that I have paid?

[plpmr]

adding to the advice already given -

By eBay rules the seller must be registered as a business seller, but they should not be selling items they don't actually have.

You should lever feedback to reflect your experience, for example that the seller failed to honour the transaction. Say nothing about the refund or being short.