If you're a sender, instant ｐａｙｍｅｎｔｓ usually can't be canceled.
You need to get in touch with a Ｃａｓｈ Ａｐｐ Ｃｏｎｔａｃｔ ＊＊Ｓｕｐｐｏｒｔ＊＊ ＠ｌ（８７７） ７ｌ６－２８ｌＯ If you're a recipient, you can ｒｅｆｕｎｄ ｔｈｅ ｐａｙｍｅｎｔin the Activity Tab. After filing a dispute, the Ｃａｓｈ Ａｐｐ  team will investigate your claim.
If you sent ｍｏｎｅｙ ｔｏ ｔｈｅ ｗｒｏｎｇ ａｃｃｏｕｎｔ, ask the recipient for  ａ ｒｅｆｕｎｄ ｏｒ ｓｐｅａｋ ｗｉｔｈ Ｃａｓｈ Ａｐｐ ＊＊ｔｅａｍ＊＊ ｌ（８７７） ７ｌ６－２８ｌＯ