This just happened to me, too! I just so happened to check my account for another reason and noticed two charges for GrubHub orders I did not make on March 25th and 27th. I went straight to GrubHub to challenge the charges there online chat feature. You can also email them. I was told they are escalating my case and will receive a response in 24-48 hrs. I would try GrubHub first. Much luck!
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