对方拒绝返还时可以起诉。
根据《民法通则》第九十二条规定：没有合法根据，取得不当利益，造成他人损失的，应当将取得的不当利益返还受损失的人。如果发现微信转账有误，事主应该及时联系对方，说明情况，要求对方退还，对方负有返还的义务。
转错账后据为己有属于不当得利，需要通过法院诉讼来主张自己的权益。如果对方拒不退还，事主可以以不当得利向法院起诉对方。
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扩展资料：
可以在微信中设置转账时间为24小时到账，转错了可以及时取消。
1、打开手机，点击桌面的微信。
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2、点击界面上方的【支付】。
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3、点击右上角的支付选项。
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4、点击界面下方的【转账到账时间】。
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5、将时间设置为【24小时到账】。
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