Charge by Seocheckout 0.35cents not refunded?

Charge by Seocheckout 0.35cents not refunded?

I also bought a service for which I paid an extra 0.35 cents . Altogether the cost was $3.35 - the seller than asked me to cancel without any explanation - I agreed as he was already late - I got back the $3 but the 0.35 cents was not refunded - this as happened now on 2 occasions so I want to know why I have not received in full the refund?

Why don't you charge the seller not the buyer?