Buying item

Hi all I boughti item at 2.15 and cancelled at 2.20 5 minutes later,seller messaged me and said couldn’t cancel as item posted 30.09.20 then got ebay notifications saying item posted out 01.10.20 have I any rights as I’m unsure
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When you receive the item open a returns case in the eBay Resolution Centre, stating that you changed your mind after purchasing the item and would therefore like to return it for a refund.  The seller ought to accept the return request and send you an eBay returns label so that you can send the item back again.  Once the seller has received the item back then he/she ought to refund the money that you paid for the item; however, if the seller doesn't respond to the case, or simply refuses to give you your money back then escalate the case to eBay as soon as you get the chance and they'll force a refund, in which case you'll receive a total refund of the money that you paid for the item.