Awaiting payment

Hi there, how long should I wait for a seller to respond after the payment went through my account? I made the mistake to buy something before checking the reviews from a UK seller. And some negative reviews say that the payment was pending for a few days and then cancelled the order...something fishy...What should I do? Should I ask for a refund? She/He accepted my offer quite quickly but she/he doesn't respond to any of my messages. Best! 

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Check the estimated delivery date on the listing and when that has passed select "I haven't received it yet" on here:

https://resolutioncentre.ebay.co.uk/

and escalate after 3 business days to get a refund.