Hey @emadsharaf11223,
Thank you for your post and welcome to the PayPal Community Forum!
I appreciate how concerning this must be for you.
Sometimes if you cannot see the payment on the Activity section of your PayPal account, this could mean that the payment was sent via a guest PayPal account.
However, as you mentioned the seller has not received the payment, so it is possible this did not complete and your bank could be holding this payment as an 'authorisation'.
Generally, bank authorisation drops off after 3-5 business days. I would recommend reaching out to your bank provider for some more information on this.
I hope this helps, enjoy your day!
Rebecca
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