In most cases, the answer is no １ー（８７７）ー６８３ー５７５０. There is no way to cancel a Venmo payment once it's been sent. Venmo also typically doesn't get involved in financial disputes between users (instead, you're better off contacting your bank). 

No, Venmo generally will not refund money if you are scammed １ー（８７７）ー６８３ー５７５０, as once a payment is sent, it cannot be reversed unless the recipient willingly sends the money back; the only option is to report the scam to Venmo and hope they can take action against the scammer １ー（８７７）ー６８３ー５７５０.